Rubicon - Wrangler Tires
#81
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires-DUH!
Set those tires to about 28 psi, and you will be much closer to the right
pressure.
"me" <noone@anywhere.com> wrote in message
news:haqAb.1250$0U4.243055@news4.srv.hcvlny.cv.net ...
> Duh, I meant to say that I have my 31x10.5x15 MT/Rs at 48 lbs. I
> believe the sidewall says 50 psi.
>
> me wrote:
>
> > Hold on. You guys are running 31x10.5x16 MT/Rs at 27 and 30 lbs on
> > road?? I've got 31x10.5x15 MT/Rs on my stock '98 TJ Sport and it
> > rides pretty nice. They are noisy even with the hard top on, but the
> > ride isn't so bad.
> >
> > Nathan Otis wrote:
> >
> >>I run mine at 27psi.
> >>n.
> >>
> >>"bob zee" <cam509@linuxmail.org> wrote in message
> >>news:bqq0e7$24j2kk$1@ID-177997.news.uni-berlin.de...
> >>
> >>
> >>>these tires have a some info on the sidewall about max load at 80psi.
> >>>80psi!?!?!
> >>>great info if you want to run a max load, but what about all of the
other
> >>>time?
> >>>
> >>>8~)>
> >>>
> >>>what would you guys run in these tires? this vehicle gets used for
about
> >>>400 miles per week (200 miles of interstate and the remainder is rural
> >>>highway and city).
> >>>
> >>>--
> >>>bob z.
> >>>p.s. the police aren't targetting you. *you* are making yourself a
> >>>
> >>>
> >>target.
> >>
> >>
> >>>"people with less brain power than you are doing more difficult things
> >>>everyday"©
> >>>
> >>>
> >>>
> >>>
> >>
> >>
> >>
> >>
>
pressure.
"me" <noone@anywhere.com> wrote in message
news:haqAb.1250$0U4.243055@news4.srv.hcvlny.cv.net ...
> Duh, I meant to say that I have my 31x10.5x15 MT/Rs at 48 lbs. I
> believe the sidewall says 50 psi.
>
> me wrote:
>
> > Hold on. You guys are running 31x10.5x16 MT/Rs at 27 and 30 lbs on
> > road?? I've got 31x10.5x15 MT/Rs on my stock '98 TJ Sport and it
> > rides pretty nice. They are noisy even with the hard top on, but the
> > ride isn't so bad.
> >
> > Nathan Otis wrote:
> >
> >>I run mine at 27psi.
> >>n.
> >>
> >>"bob zee" <cam509@linuxmail.org> wrote in message
> >>news:bqq0e7$24j2kk$1@ID-177997.news.uni-berlin.de...
> >>
> >>
> >>>these tires have a some info on the sidewall about max load at 80psi.
> >>>80psi!?!?!
> >>>great info if you want to run a max load, but what about all of the
other
> >>>time?
> >>>
> >>>8~)>
> >>>
> >>>what would you guys run in these tires? this vehicle gets used for
about
> >>>400 miles per week (200 miles of interstate and the remainder is rural
> >>>highway and city).
> >>>
> >>>--
> >>>bob z.
> >>>p.s. the police aren't targetting you. *you* are making yourself a
> >>>
> >>>
> >>target.
> >>
> >>
> >>>"people with less brain power than you are doing more difficult things
> >>>everyday"©
> >>>
> >>>
> >>>
> >>>
> >>
> >>
> >>
> >>
>
#82
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires-DUH!
Set those tires to about 28 psi, and you will be much closer to the right
pressure.
"me" <noone@anywhere.com> wrote in message
news:haqAb.1250$0U4.243055@news4.srv.hcvlny.cv.net ...
> Duh, I meant to say that I have my 31x10.5x15 MT/Rs at 48 lbs. I
> believe the sidewall says 50 psi.
>
> me wrote:
>
> > Hold on. You guys are running 31x10.5x16 MT/Rs at 27 and 30 lbs on
> > road?? I've got 31x10.5x15 MT/Rs on my stock '98 TJ Sport and it
> > rides pretty nice. They are noisy even with the hard top on, but the
> > ride isn't so bad.
> >
> > Nathan Otis wrote:
> >
> >>I run mine at 27psi.
> >>n.
> >>
> >>"bob zee" <cam509@linuxmail.org> wrote in message
> >>news:bqq0e7$24j2kk$1@ID-177997.news.uni-berlin.de...
> >>
> >>
> >>>these tires have a some info on the sidewall about max load at 80psi.
> >>>80psi!?!?!
> >>>great info if you want to run a max load, but what about all of the
other
> >>>time?
> >>>
> >>>8~)>
> >>>
> >>>what would you guys run in these tires? this vehicle gets used for
about
> >>>400 miles per week (200 miles of interstate and the remainder is rural
> >>>highway and city).
> >>>
> >>>--
> >>>bob z.
> >>>p.s. the police aren't targetting you. *you* are making yourself a
> >>>
> >>>
> >>target.
> >>
> >>
> >>>"people with less brain power than you are doing more difficult things
> >>>everyday"©
> >>>
> >>>
> >>>
> >>>
> >>
> >>
> >>
> >>
>
pressure.
"me" <noone@anywhere.com> wrote in message
news:haqAb.1250$0U4.243055@news4.srv.hcvlny.cv.net ...
> Duh, I meant to say that I have my 31x10.5x15 MT/Rs at 48 lbs. I
> believe the sidewall says 50 psi.
>
> me wrote:
>
> > Hold on. You guys are running 31x10.5x16 MT/Rs at 27 and 30 lbs on
> > road?? I've got 31x10.5x15 MT/Rs on my stock '98 TJ Sport and it
> > rides pretty nice. They are noisy even with the hard top on, but the
> > ride isn't so bad.
> >
> > Nathan Otis wrote:
> >
> >>I run mine at 27psi.
> >>n.
> >>
> >>"bob zee" <cam509@linuxmail.org> wrote in message
> >>news:bqq0e7$24j2kk$1@ID-177997.news.uni-berlin.de...
> >>
> >>
> >>>these tires have a some info on the sidewall about max load at 80psi.
> >>>80psi!?!?!
> >>>great info if you want to run a max load, but what about all of the
other
> >>>time?
> >>>
> >>>8~)>
> >>>
> >>>what would you guys run in these tires? this vehicle gets used for
about
> >>>400 miles per week (200 miles of interstate and the remainder is rural
> >>>highway and city).
> >>>
> >>>--
> >>>bob z.
> >>>p.s. the police aren't targetting you. *you* are making yourself a
> >>>
> >>>
> >>target.
> >>
> >>
> >>>"people with less brain power than you are doing more difficult things
> >>>everyday"©
> >>>
> >>>
> >>>
> >>>
> >>
> >>
> >>
> >>
>
#83
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires-DUH!
I would have thunk you knew this because you have found that your 9.50s
prevail where guys with 12.50s have trouble. Your 9.50s are better for
almost exactly the same reasons as overinflating.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3FD25AF7.D3D1FE10@sympatico.ca...
> Interesting info, thanks.
>
> The tires I was thinking on were P215x60x15. They are wide and flat,
> and those suckers lifted off at high pressure and never let go at the
> lower proper psi, you could cruise at 70 with the traffic easy in the
> rain.
>
> You are going for the wider the footprint, the lower the psi contact
> patch is so light the whole tire floats.
>
> These ones just up and lost it when they hit a puddle.
>
> A narrow tire (7.5") like I have doesn't really have issues like a 10.5
> or 12.5 tire.
>
> Your formula is based on one sized tire I think. Tall skinny sure
> reacts to traction issues different than shorter or the same height,
> wide tire.
>
> Mike
>
> Jerry Bransford wrote:
> >
> > Mike, the higher the tire pressure, the faster a tire can be driven
without
> > hydroplaning. That's because the narrower the footprint, the less tire
> > surface the water can push against. That's why snow skiis wouldn't work
for
> > waterskiing unless you were going 90 mph. ;)
> >
> > A simple formula taught to pilots to determine the estimated speed at
which
> > a tire will hydroplane is 9 times the square root of the tire pressure
> > equals the estimated speed a tire will hydroplane at. So for example if
a
> > tire were inflated to 25 psi, it would likely hydroplane somewhere near
45
> > mph. If that same tire were inflated higher to 36 psi, it'd likely
> > hydroplane at 54 mph. So the air pressure the tire is filled to is
directly
> > proportional to the estimated speed at which it will hydroplane at. :)
> >
> > Jerry
> > --
> > Jerry Bransford
> > To email, remove 'me' from my email address
> > KC6TAY, PP-ASEL
> > See the Geezer Jeep at
> > http://members.***.net/jerrypb/
> >
> > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > news:3FD24818.B3B8B0B6@sympatico.ca...
> > > I drove my brother in laws Volvo once with 60 series tires on it and
> > > that thing couldn't go over 50 mph in a heavy rain without losing the
> > > steering control due to hydroplaning.
> > >
> > > Turns out the tires were at the sidewall max pressure, not the 32 psi
> > > recommended. The water had free space to get under the sides of the
> > > tread lifting the tire up off the road.
> > >
> > > I do agree too low is bad too.
> > >
> > > Mike
> > >
> > > mabar wrote:
> > > >
> > > > Mike:
> > > >
> > > > I agree, 48 lbs. is WAY TOO MUCH pressure for that application, but
as
> > far
> > > > as hydroplaning goes...
> > > >
> > > > A tire with lower than recommended pressure will hydroplane easier,
> > quicker,
> > > > and at lower speeds.
> > > >
> > > > A tire with higher than recommended pressure will hydroplane less,
and
> > > > usually at higher speeds.
> > > >
> > > > Tom
> > > >
> > > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > > news:3FD234FC.A668B58@sympatico.ca...
> > > > > That is actually pretty dangerous.....
> > > > >
> > > > > At that pressure you only have about 1/4 of your tread actually
> > touching
> > > > > the road when you drive straight.
> > > > >
> > > > > This can lead to a fast end to end swap if you hit water or snow.
> > They
> > > > > will hydroplane fast and quick and you will be doing 360's quicker
> > than
> > > > > you can blink.
> > > > >
> > > > > The water will get under the other 3/4 of the tread and literally
lift
> > > > > you right off the road.
> > > > >
> > > > > I tested my 33x9.5's with 35 psi in them and only had 4" of tread
on
> > the
> > > > > ground. I got the best grip at 28 psi.
> > > > >
> > > > > When I used 31x10.5's they wore out perfectly even all across and
I
> > was
> > > > > running at 26 psi city, 28 highway.
> > > > >
> > > > > Now If I had those tires on a 1 ton truck and carried a load, I
would
> > > > > run them close to the top rated pressure.
> > > > >
> > > > > But a Wrangler is only a 1/4 ton truck.....
> > > > >
> > > > > Mike
> > > > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > > > 88 Cherokee 235 BFG AT's
> > > > >
> > > > > > me wrote:
> > > > > >
> > > > > > Duh, I meant to say that I have my 31x10.5x15 MT/Rs at 48 lbs.
I
> > > > > > believe the sidewall says 50 psi.
> > > > > >
> > > > > > me wrote:
> > > > > >
> > > > > > > Hold on. You guys are running 31x10.5x16 MT/Rs at 27 and 30
lbs
> > on
> > > > > > > road?? I've got 31x10.5x15 MT/Rs on my stock '98 TJ Sport and
it
> > > > > > > rides pretty nice. They are noisy even with the hard top on,
but
> > > > > > > the ride isn't so bad.
> > > > > > >
> > > > > > > Nathan Otis wrote:
> > > > > > >
> > > > > > >> I run mine at 27psi.
> > > > > > >> n.
> > > > > > >>
> > > > > > >> "bob zee" <cam509@linuxmail.org> wrote in message
> > > > > > >> news:bqq0e7$24j2kk$1@ID-177997.news.uni-berlin.de...
> > > > > > >>
> > > > > > >>
> > > > > > >> > these tires have a some info on the sidewall about max load
at
> > > > > > >> > 80psi.
> > > > > > >> > 80psi!?!?!
> > > > > > >> > great info if you want to run a max load, but what about
all of
> > > > > > >> > the other
> > > > > > >> > time?
> > > > > > >> >
> > > > > > >> > 8~)>
> > > > > > >> >
> > > > > > >> > what would you guys run in these tires? this vehicle gets
used
> > > > > > >> > for about
> > > > > > >> > 400 miles per week (200 miles of interstate and the
remainder
> > is
> > > > > > >> > rural
> > > > > > >> > highway and city).
> > > > > > >> >
> > > > > > >> > --
> > > > > > >> > bob z.
> > > > > > >> > p.s. the police aren't targetting you. *you* are making
> > > > > > >> > yourself a
> > > > > > >> >
> > > > > > >> >
> > > > > > >> target.
> > > > > > >>
> > > > > > >>
> > > > > > >> > "people with less brain power than you are doing more diffi
cult
> > > > > > >> > things
> > > > > > >> > everyday"©
> > > > > > >> >
> > > > > > >> >
> > > > > > >> >
> > > > > > >> >
> > > > > > >>
> > > > > > >>
> > > > > > >>
prevail where guys with 12.50s have trouble. Your 9.50s are better for
almost exactly the same reasons as overinflating.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3FD25AF7.D3D1FE10@sympatico.ca...
> Interesting info, thanks.
>
> The tires I was thinking on were P215x60x15. They are wide and flat,
> and those suckers lifted off at high pressure and never let go at the
> lower proper psi, you could cruise at 70 with the traffic easy in the
> rain.
>
> You are going for the wider the footprint, the lower the psi contact
> patch is so light the whole tire floats.
>
> These ones just up and lost it when they hit a puddle.
>
> A narrow tire (7.5") like I have doesn't really have issues like a 10.5
> or 12.5 tire.
>
> Your formula is based on one sized tire I think. Tall skinny sure
> reacts to traction issues different than shorter or the same height,
> wide tire.
>
> Mike
>
> Jerry Bransford wrote:
> >
> > Mike, the higher the tire pressure, the faster a tire can be driven
without
> > hydroplaning. That's because the narrower the footprint, the less tire
> > surface the water can push against. That's why snow skiis wouldn't work
for
> > waterskiing unless you were going 90 mph. ;)
> >
> > A simple formula taught to pilots to determine the estimated speed at
which
> > a tire will hydroplane is 9 times the square root of the tire pressure
> > equals the estimated speed a tire will hydroplane at. So for example if
a
> > tire were inflated to 25 psi, it would likely hydroplane somewhere near
45
> > mph. If that same tire were inflated higher to 36 psi, it'd likely
> > hydroplane at 54 mph. So the air pressure the tire is filled to is
directly
> > proportional to the estimated speed at which it will hydroplane at. :)
> >
> > Jerry
> > --
> > Jerry Bransford
> > To email, remove 'me' from my email address
> > KC6TAY, PP-ASEL
> > See the Geezer Jeep at
> > http://members.***.net/jerrypb/
> >
> > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > news:3FD24818.B3B8B0B6@sympatico.ca...
> > > I drove my brother in laws Volvo once with 60 series tires on it and
> > > that thing couldn't go over 50 mph in a heavy rain without losing the
> > > steering control due to hydroplaning.
> > >
> > > Turns out the tires were at the sidewall max pressure, not the 32 psi
> > > recommended. The water had free space to get under the sides of the
> > > tread lifting the tire up off the road.
> > >
> > > I do agree too low is bad too.
> > >
> > > Mike
> > >
> > > mabar wrote:
> > > >
> > > > Mike:
> > > >
> > > > I agree, 48 lbs. is WAY TOO MUCH pressure for that application, but
as
> > far
> > > > as hydroplaning goes...
> > > >
> > > > A tire with lower than recommended pressure will hydroplane easier,
> > quicker,
> > > > and at lower speeds.
> > > >
> > > > A tire with higher than recommended pressure will hydroplane less,
and
> > > > usually at higher speeds.
> > > >
> > > > Tom
> > > >
> > > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > > news:3FD234FC.A668B58@sympatico.ca...
> > > > > That is actually pretty dangerous.....
> > > > >
> > > > > At that pressure you only have about 1/4 of your tread actually
> > touching
> > > > > the road when you drive straight.
> > > > >
> > > > > This can lead to a fast end to end swap if you hit water or snow.
> > They
> > > > > will hydroplane fast and quick and you will be doing 360's quicker
> > than
> > > > > you can blink.
> > > > >
> > > > > The water will get under the other 3/4 of the tread and literally
lift
> > > > > you right off the road.
> > > > >
> > > > > I tested my 33x9.5's with 35 psi in them and only had 4" of tread
on
> > the
> > > > > ground. I got the best grip at 28 psi.
> > > > >
> > > > > When I used 31x10.5's they wore out perfectly even all across and
I
> > was
> > > > > running at 26 psi city, 28 highway.
> > > > >
> > > > > Now If I had those tires on a 1 ton truck and carried a load, I
would
> > > > > run them close to the top rated pressure.
> > > > >
> > > > > But a Wrangler is only a 1/4 ton truck.....
> > > > >
> > > > > Mike
> > > > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > > > 88 Cherokee 235 BFG AT's
> > > > >
> > > > > > me wrote:
> > > > > >
> > > > > > Duh, I meant to say that I have my 31x10.5x15 MT/Rs at 48 lbs.
I
> > > > > > believe the sidewall says 50 psi.
> > > > > >
> > > > > > me wrote:
> > > > > >
> > > > > > > Hold on. You guys are running 31x10.5x16 MT/Rs at 27 and 30
lbs
> > on
> > > > > > > road?? I've got 31x10.5x15 MT/Rs on my stock '98 TJ Sport and
it
> > > > > > > rides pretty nice. They are noisy even with the hard top on,
but
> > > > > > > the ride isn't so bad.
> > > > > > >
> > > > > > > Nathan Otis wrote:
> > > > > > >
> > > > > > >> I run mine at 27psi.
> > > > > > >> n.
> > > > > > >>
> > > > > > >> "bob zee" <cam509@linuxmail.org> wrote in message
> > > > > > >> news:bqq0e7$24j2kk$1@ID-177997.news.uni-berlin.de...
> > > > > > >>
> > > > > > >>
> > > > > > >> > these tires have a some info on the sidewall about max load
at
> > > > > > >> > 80psi.
> > > > > > >> > 80psi!?!?!
> > > > > > >> > great info if you want to run a max load, but what about
all of
> > > > > > >> > the other
> > > > > > >> > time?
> > > > > > >> >
> > > > > > >> > 8~)>
> > > > > > >> >
> > > > > > >> > what would you guys run in these tires? this vehicle gets
used
> > > > > > >> > for about
> > > > > > >> > 400 miles per week (200 miles of interstate and the
remainder
> > is
> > > > > > >> > rural
> > > > > > >> > highway and city).
> > > > > > >> >
> > > > > > >> > --
> > > > > > >> > bob z.
> > > > > > >> > p.s. the police aren't targetting you. *you* are making
> > > > > > >> > yourself a
> > > > > > >> >
> > > > > > >> >
> > > > > > >> target.
> > > > > > >>
> > > > > > >>
> > > > > > >> > "people with less brain power than you are doing more diffi
cult
> > > > > > >> > things
> > > > > > >> > everyday"©
> > > > > > >> >
> > > > > > >> >
> > > > > > >> >
> > > > > > >> >
> > > > > > >>
> > > > > > >>
> > > > > > >>
#84
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires-DUH!
I would have thunk you knew this because you have found that your 9.50s
prevail where guys with 12.50s have trouble. Your 9.50s are better for
almost exactly the same reasons as overinflating.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3FD25AF7.D3D1FE10@sympatico.ca...
> Interesting info, thanks.
>
> The tires I was thinking on were P215x60x15. They are wide and flat,
> and those suckers lifted off at high pressure and never let go at the
> lower proper psi, you could cruise at 70 with the traffic easy in the
> rain.
>
> You are going for the wider the footprint, the lower the psi contact
> patch is so light the whole tire floats.
>
> These ones just up and lost it when they hit a puddle.
>
> A narrow tire (7.5") like I have doesn't really have issues like a 10.5
> or 12.5 tire.
>
> Your formula is based on one sized tire I think. Tall skinny sure
> reacts to traction issues different than shorter or the same height,
> wide tire.
>
> Mike
>
> Jerry Bransford wrote:
> >
> > Mike, the higher the tire pressure, the faster a tire can be driven
without
> > hydroplaning. That's because the narrower the footprint, the less tire
> > surface the water can push against. That's why snow skiis wouldn't work
for
> > waterskiing unless you were going 90 mph. ;)
> >
> > A simple formula taught to pilots to determine the estimated speed at
which
> > a tire will hydroplane is 9 times the square root of the tire pressure
> > equals the estimated speed a tire will hydroplane at. So for example if
a
> > tire were inflated to 25 psi, it would likely hydroplane somewhere near
45
> > mph. If that same tire were inflated higher to 36 psi, it'd likely
> > hydroplane at 54 mph. So the air pressure the tire is filled to is
directly
> > proportional to the estimated speed at which it will hydroplane at. :)
> >
> > Jerry
> > --
> > Jerry Bransford
> > To email, remove 'me' from my email address
> > KC6TAY, PP-ASEL
> > See the Geezer Jeep at
> > http://members.***.net/jerrypb/
> >
> > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > news:3FD24818.B3B8B0B6@sympatico.ca...
> > > I drove my brother in laws Volvo once with 60 series tires on it and
> > > that thing couldn't go over 50 mph in a heavy rain without losing the
> > > steering control due to hydroplaning.
> > >
> > > Turns out the tires were at the sidewall max pressure, not the 32 psi
> > > recommended. The water had free space to get under the sides of the
> > > tread lifting the tire up off the road.
> > >
> > > I do agree too low is bad too.
> > >
> > > Mike
> > >
> > > mabar wrote:
> > > >
> > > > Mike:
> > > >
> > > > I agree, 48 lbs. is WAY TOO MUCH pressure for that application, but
as
> > far
> > > > as hydroplaning goes...
> > > >
> > > > A tire with lower than recommended pressure will hydroplane easier,
> > quicker,
> > > > and at lower speeds.
> > > >
> > > > A tire with higher than recommended pressure will hydroplane less,
and
> > > > usually at higher speeds.
> > > >
> > > > Tom
> > > >
> > > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > > news:3FD234FC.A668B58@sympatico.ca...
> > > > > That is actually pretty dangerous.....
> > > > >
> > > > > At that pressure you only have about 1/4 of your tread actually
> > touching
> > > > > the road when you drive straight.
> > > > >
> > > > > This can lead to a fast end to end swap if you hit water or snow.
> > They
> > > > > will hydroplane fast and quick and you will be doing 360's quicker
> > than
> > > > > you can blink.
> > > > >
> > > > > The water will get under the other 3/4 of the tread and literally
lift
> > > > > you right off the road.
> > > > >
> > > > > I tested my 33x9.5's with 35 psi in them and only had 4" of tread
on
> > the
> > > > > ground. I got the best grip at 28 psi.
> > > > >
> > > > > When I used 31x10.5's they wore out perfectly even all across and
I
> > was
> > > > > running at 26 psi city, 28 highway.
> > > > >
> > > > > Now If I had those tires on a 1 ton truck and carried a load, I
would
> > > > > run them close to the top rated pressure.
> > > > >
> > > > > But a Wrangler is only a 1/4 ton truck.....
> > > > >
> > > > > Mike
> > > > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > > > 88 Cherokee 235 BFG AT's
> > > > >
> > > > > > me wrote:
> > > > > >
> > > > > > Duh, I meant to say that I have my 31x10.5x15 MT/Rs at 48 lbs.
I
> > > > > > believe the sidewall says 50 psi.
> > > > > >
> > > > > > me wrote:
> > > > > >
> > > > > > > Hold on. You guys are running 31x10.5x16 MT/Rs at 27 and 30
lbs
> > on
> > > > > > > road?? I've got 31x10.5x15 MT/Rs on my stock '98 TJ Sport and
it
> > > > > > > rides pretty nice. They are noisy even with the hard top on,
but
> > > > > > > the ride isn't so bad.
> > > > > > >
> > > > > > > Nathan Otis wrote:
> > > > > > >
> > > > > > >> I run mine at 27psi.
> > > > > > >> n.
> > > > > > >>
> > > > > > >> "bob zee" <cam509@linuxmail.org> wrote in message
> > > > > > >> news:bqq0e7$24j2kk$1@ID-177997.news.uni-berlin.de...
> > > > > > >>
> > > > > > >>
> > > > > > >> > these tires have a some info on the sidewall about max load
at
> > > > > > >> > 80psi.
> > > > > > >> > 80psi!?!?!
> > > > > > >> > great info if you want to run a max load, but what about
all of
> > > > > > >> > the other
> > > > > > >> > time?
> > > > > > >> >
> > > > > > >> > 8~)>
> > > > > > >> >
> > > > > > >> > what would you guys run in these tires? this vehicle gets
used
> > > > > > >> > for about
> > > > > > >> > 400 miles per week (200 miles of interstate and the
remainder
> > is
> > > > > > >> > rural
> > > > > > >> > highway and city).
> > > > > > >> >
> > > > > > >> > --
> > > > > > >> > bob z.
> > > > > > >> > p.s. the police aren't targetting you. *you* are making
> > > > > > >> > yourself a
> > > > > > >> >
> > > > > > >> >
> > > > > > >> target.
> > > > > > >>
> > > > > > >>
> > > > > > >> > "people with less brain power than you are doing more diffi
cult
> > > > > > >> > things
> > > > > > >> > everyday"©
> > > > > > >> >
> > > > > > >> >
> > > > > > >> >
> > > > > > >> >
> > > > > > >>
> > > > > > >>
> > > > > > >>
prevail where guys with 12.50s have trouble. Your 9.50s are better for
almost exactly the same reasons as overinflating.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3FD25AF7.D3D1FE10@sympatico.ca...
> Interesting info, thanks.
>
> The tires I was thinking on were P215x60x15. They are wide and flat,
> and those suckers lifted off at high pressure and never let go at the
> lower proper psi, you could cruise at 70 with the traffic easy in the
> rain.
>
> You are going for the wider the footprint, the lower the psi contact
> patch is so light the whole tire floats.
>
> These ones just up and lost it when they hit a puddle.
>
> A narrow tire (7.5") like I have doesn't really have issues like a 10.5
> or 12.5 tire.
>
> Your formula is based on one sized tire I think. Tall skinny sure
> reacts to traction issues different than shorter or the same height,
> wide tire.
>
> Mike
>
> Jerry Bransford wrote:
> >
> > Mike, the higher the tire pressure, the faster a tire can be driven
without
> > hydroplaning. That's because the narrower the footprint, the less tire
> > surface the water can push against. That's why snow skiis wouldn't work
for
> > waterskiing unless you were going 90 mph. ;)
> >
> > A simple formula taught to pilots to determine the estimated speed at
which
> > a tire will hydroplane is 9 times the square root of the tire pressure
> > equals the estimated speed a tire will hydroplane at. So for example if
a
> > tire were inflated to 25 psi, it would likely hydroplane somewhere near
45
> > mph. If that same tire were inflated higher to 36 psi, it'd likely
> > hydroplane at 54 mph. So the air pressure the tire is filled to is
directly
> > proportional to the estimated speed at which it will hydroplane at. :)
> >
> > Jerry
> > --
> > Jerry Bransford
> > To email, remove 'me' from my email address
> > KC6TAY, PP-ASEL
> > See the Geezer Jeep at
> > http://members.***.net/jerrypb/
> >
> > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > news:3FD24818.B3B8B0B6@sympatico.ca...
> > > I drove my brother in laws Volvo once with 60 series tires on it and
> > > that thing couldn't go over 50 mph in a heavy rain without losing the
> > > steering control due to hydroplaning.
> > >
> > > Turns out the tires were at the sidewall max pressure, not the 32 psi
> > > recommended. The water had free space to get under the sides of the
> > > tread lifting the tire up off the road.
> > >
> > > I do agree too low is bad too.
> > >
> > > Mike
> > >
> > > mabar wrote:
> > > >
> > > > Mike:
> > > >
> > > > I agree, 48 lbs. is WAY TOO MUCH pressure for that application, but
as
> > far
> > > > as hydroplaning goes...
> > > >
> > > > A tire with lower than recommended pressure will hydroplane easier,
> > quicker,
> > > > and at lower speeds.
> > > >
> > > > A tire with higher than recommended pressure will hydroplane less,
and
> > > > usually at higher speeds.
> > > >
> > > > Tom
> > > >
> > > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > > news:3FD234FC.A668B58@sympatico.ca...
> > > > > That is actually pretty dangerous.....
> > > > >
> > > > > At that pressure you only have about 1/4 of your tread actually
> > touching
> > > > > the road when you drive straight.
> > > > >
> > > > > This can lead to a fast end to end swap if you hit water or snow.
> > They
> > > > > will hydroplane fast and quick and you will be doing 360's quicker
> > than
> > > > > you can blink.
> > > > >
> > > > > The water will get under the other 3/4 of the tread and literally
lift
> > > > > you right off the road.
> > > > >
> > > > > I tested my 33x9.5's with 35 psi in them and only had 4" of tread
on
> > the
> > > > > ground. I got the best grip at 28 psi.
> > > > >
> > > > > When I used 31x10.5's they wore out perfectly even all across and
I
> > was
> > > > > running at 26 psi city, 28 highway.
> > > > >
> > > > > Now If I had those tires on a 1 ton truck and carried a load, I
would
> > > > > run them close to the top rated pressure.
> > > > >
> > > > > But a Wrangler is only a 1/4 ton truck.....
> > > > >
> > > > > Mike
> > > > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > > > 88 Cherokee 235 BFG AT's
> > > > >
> > > > > > me wrote:
> > > > > >
> > > > > > Duh, I meant to say that I have my 31x10.5x15 MT/Rs at 48 lbs.
I
> > > > > > believe the sidewall says 50 psi.
> > > > > >
> > > > > > me wrote:
> > > > > >
> > > > > > > Hold on. You guys are running 31x10.5x16 MT/Rs at 27 and 30
lbs
> > on
> > > > > > > road?? I've got 31x10.5x15 MT/Rs on my stock '98 TJ Sport and
it
> > > > > > > rides pretty nice. They are noisy even with the hard top on,
but
> > > > > > > the ride isn't so bad.
> > > > > > >
> > > > > > > Nathan Otis wrote:
> > > > > > >
> > > > > > >> I run mine at 27psi.
> > > > > > >> n.
> > > > > > >>
> > > > > > >> "bob zee" <cam509@linuxmail.org> wrote in message
> > > > > > >> news:bqq0e7$24j2kk$1@ID-177997.news.uni-berlin.de...
> > > > > > >>
> > > > > > >>
> > > > > > >> > these tires have a some info on the sidewall about max load
at
> > > > > > >> > 80psi.
> > > > > > >> > 80psi!?!?!
> > > > > > >> > great info if you want to run a max load, but what about
all of
> > > > > > >> > the other
> > > > > > >> > time?
> > > > > > >> >
> > > > > > >> > 8~)>
> > > > > > >> >
> > > > > > >> > what would you guys run in these tires? this vehicle gets
used
> > > > > > >> > for about
> > > > > > >> > 400 miles per week (200 miles of interstate and the
remainder
> > is
> > > > > > >> > rural
> > > > > > >> > highway and city).
> > > > > > >> >
> > > > > > >> > --
> > > > > > >> > bob z.
> > > > > > >> > p.s. the police aren't targetting you. *you* are making
> > > > > > >> > yourself a
> > > > > > >> >
> > > > > > >> >
> > > > > > >> target.
> > > > > > >>
> > > > > > >>
> > > > > > >> > "people with less brain power than you are doing more diffi
cult
> > > > > > >> > things
> > > > > > >> > everyday"©
> > > > > > >> >
> > > > > > >> >
> > > > > > >> >
> > > > > > >> >
> > > > > > >>
> > > > > > >>
> > > > > > >>
#85
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires-DUH!
I would have thunk you knew this because you have found that your 9.50s
prevail where guys with 12.50s have trouble. Your 9.50s are better for
almost exactly the same reasons as overinflating.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3FD25AF7.D3D1FE10@sympatico.ca...
> Interesting info, thanks.
>
> The tires I was thinking on were P215x60x15. They are wide and flat,
> and those suckers lifted off at high pressure and never let go at the
> lower proper psi, you could cruise at 70 with the traffic easy in the
> rain.
>
> You are going for the wider the footprint, the lower the psi contact
> patch is so light the whole tire floats.
>
> These ones just up and lost it when they hit a puddle.
>
> A narrow tire (7.5") like I have doesn't really have issues like a 10.5
> or 12.5 tire.
>
> Your formula is based on one sized tire I think. Tall skinny sure
> reacts to traction issues different than shorter or the same height,
> wide tire.
>
> Mike
>
> Jerry Bransford wrote:
> >
> > Mike, the higher the tire pressure, the faster a tire can be driven
without
> > hydroplaning. That's because the narrower the footprint, the less tire
> > surface the water can push against. That's why snow skiis wouldn't work
for
> > waterskiing unless you were going 90 mph. ;)
> >
> > A simple formula taught to pilots to determine the estimated speed at
which
> > a tire will hydroplane is 9 times the square root of the tire pressure
> > equals the estimated speed a tire will hydroplane at. So for example if
a
> > tire were inflated to 25 psi, it would likely hydroplane somewhere near
45
> > mph. If that same tire were inflated higher to 36 psi, it'd likely
> > hydroplane at 54 mph. So the air pressure the tire is filled to is
directly
> > proportional to the estimated speed at which it will hydroplane at. :)
> >
> > Jerry
> > --
> > Jerry Bransford
> > To email, remove 'me' from my email address
> > KC6TAY, PP-ASEL
> > See the Geezer Jeep at
> > http://members.***.net/jerrypb/
> >
> > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > news:3FD24818.B3B8B0B6@sympatico.ca...
> > > I drove my brother in laws Volvo once with 60 series tires on it and
> > > that thing couldn't go over 50 mph in a heavy rain without losing the
> > > steering control due to hydroplaning.
> > >
> > > Turns out the tires were at the sidewall max pressure, not the 32 psi
> > > recommended. The water had free space to get under the sides of the
> > > tread lifting the tire up off the road.
> > >
> > > I do agree too low is bad too.
> > >
> > > Mike
> > >
> > > mabar wrote:
> > > >
> > > > Mike:
> > > >
> > > > I agree, 48 lbs. is WAY TOO MUCH pressure for that application, but
as
> > far
> > > > as hydroplaning goes...
> > > >
> > > > A tire with lower than recommended pressure will hydroplane easier,
> > quicker,
> > > > and at lower speeds.
> > > >
> > > > A tire with higher than recommended pressure will hydroplane less,
and
> > > > usually at higher speeds.
> > > >
> > > > Tom
> > > >
> > > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > > news:3FD234FC.A668B58@sympatico.ca...
> > > > > That is actually pretty dangerous.....
> > > > >
> > > > > At that pressure you only have about 1/4 of your tread actually
> > touching
> > > > > the road when you drive straight.
> > > > >
> > > > > This can lead to a fast end to end swap if you hit water or snow.
> > They
> > > > > will hydroplane fast and quick and you will be doing 360's quicker
> > than
> > > > > you can blink.
> > > > >
> > > > > The water will get under the other 3/4 of the tread and literally
lift
> > > > > you right off the road.
> > > > >
> > > > > I tested my 33x9.5's with 35 psi in them and only had 4" of tread
on
> > the
> > > > > ground. I got the best grip at 28 psi.
> > > > >
> > > > > When I used 31x10.5's they wore out perfectly even all across and
I
> > was
> > > > > running at 26 psi city, 28 highway.
> > > > >
> > > > > Now If I had those tires on a 1 ton truck and carried a load, I
would
> > > > > run them close to the top rated pressure.
> > > > >
> > > > > But a Wrangler is only a 1/4 ton truck.....
> > > > >
> > > > > Mike
> > > > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > > > 88 Cherokee 235 BFG AT's
> > > > >
> > > > > > me wrote:
> > > > > >
> > > > > > Duh, I meant to say that I have my 31x10.5x15 MT/Rs at 48 lbs.
I
> > > > > > believe the sidewall says 50 psi.
> > > > > >
> > > > > > me wrote:
> > > > > >
> > > > > > > Hold on. You guys are running 31x10.5x16 MT/Rs at 27 and 30
lbs
> > on
> > > > > > > road?? I've got 31x10.5x15 MT/Rs on my stock '98 TJ Sport and
it
> > > > > > > rides pretty nice. They are noisy even with the hard top on,
but
> > > > > > > the ride isn't so bad.
> > > > > > >
> > > > > > > Nathan Otis wrote:
> > > > > > >
> > > > > > >> I run mine at 27psi.
> > > > > > >> n.
> > > > > > >>
> > > > > > >> "bob zee" <cam509@linuxmail.org> wrote in message
> > > > > > >> news:bqq0e7$24j2kk$1@ID-177997.news.uni-berlin.de...
> > > > > > >>
> > > > > > >>
> > > > > > >> > these tires have a some info on the sidewall about max load
at
> > > > > > >> > 80psi.
> > > > > > >> > 80psi!?!?!
> > > > > > >> > great info if you want to run a max load, but what about
all of
> > > > > > >> > the other
> > > > > > >> > time?
> > > > > > >> >
> > > > > > >> > 8~)>
> > > > > > >> >
> > > > > > >> > what would you guys run in these tires? this vehicle gets
used
> > > > > > >> > for about
> > > > > > >> > 400 miles per week (200 miles of interstate and the
remainder
> > is
> > > > > > >> > rural
> > > > > > >> > highway and city).
> > > > > > >> >
> > > > > > >> > --
> > > > > > >> > bob z.
> > > > > > >> > p.s. the police aren't targetting you. *you* are making
> > > > > > >> > yourself a
> > > > > > >> >
> > > > > > >> >
> > > > > > >> target.
> > > > > > >>
> > > > > > >>
> > > > > > >> > "people with less brain power than you are doing more diffi
cult
> > > > > > >> > things
> > > > > > >> > everyday"©
> > > > > > >> >
> > > > > > >> >
> > > > > > >> >
> > > > > > >> >
> > > > > > >>
> > > > > > >>
> > > > > > >>
prevail where guys with 12.50s have trouble. Your 9.50s are better for
almost exactly the same reasons as overinflating.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3FD25AF7.D3D1FE10@sympatico.ca...
> Interesting info, thanks.
>
> The tires I was thinking on were P215x60x15. They are wide and flat,
> and those suckers lifted off at high pressure and never let go at the
> lower proper psi, you could cruise at 70 with the traffic easy in the
> rain.
>
> You are going for the wider the footprint, the lower the psi contact
> patch is so light the whole tire floats.
>
> These ones just up and lost it when they hit a puddle.
>
> A narrow tire (7.5") like I have doesn't really have issues like a 10.5
> or 12.5 tire.
>
> Your formula is based on one sized tire I think. Tall skinny sure
> reacts to traction issues different than shorter or the same height,
> wide tire.
>
> Mike
>
> Jerry Bransford wrote:
> >
> > Mike, the higher the tire pressure, the faster a tire can be driven
without
> > hydroplaning. That's because the narrower the footprint, the less tire
> > surface the water can push against. That's why snow skiis wouldn't work
for
> > waterskiing unless you were going 90 mph. ;)
> >
> > A simple formula taught to pilots to determine the estimated speed at
which
> > a tire will hydroplane is 9 times the square root of the tire pressure
> > equals the estimated speed a tire will hydroplane at. So for example if
a
> > tire were inflated to 25 psi, it would likely hydroplane somewhere near
45
> > mph. If that same tire were inflated higher to 36 psi, it'd likely
> > hydroplane at 54 mph. So the air pressure the tire is filled to is
directly
> > proportional to the estimated speed at which it will hydroplane at. :)
> >
> > Jerry
> > --
> > Jerry Bransford
> > To email, remove 'me' from my email address
> > KC6TAY, PP-ASEL
> > See the Geezer Jeep at
> > http://members.***.net/jerrypb/
> >
> > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > news:3FD24818.B3B8B0B6@sympatico.ca...
> > > I drove my brother in laws Volvo once with 60 series tires on it and
> > > that thing couldn't go over 50 mph in a heavy rain without losing the
> > > steering control due to hydroplaning.
> > >
> > > Turns out the tires were at the sidewall max pressure, not the 32 psi
> > > recommended. The water had free space to get under the sides of the
> > > tread lifting the tire up off the road.
> > >
> > > I do agree too low is bad too.
> > >
> > > Mike
> > >
> > > mabar wrote:
> > > >
> > > > Mike:
> > > >
> > > > I agree, 48 lbs. is WAY TOO MUCH pressure for that application, but
as
> > far
> > > > as hydroplaning goes...
> > > >
> > > > A tire with lower than recommended pressure will hydroplane easier,
> > quicker,
> > > > and at lower speeds.
> > > >
> > > > A tire with higher than recommended pressure will hydroplane less,
and
> > > > usually at higher speeds.
> > > >
> > > > Tom
> > > >
> > > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > > news:3FD234FC.A668B58@sympatico.ca...
> > > > > That is actually pretty dangerous.....
> > > > >
> > > > > At that pressure you only have about 1/4 of your tread actually
> > touching
> > > > > the road when you drive straight.
> > > > >
> > > > > This can lead to a fast end to end swap if you hit water or snow.
> > They
> > > > > will hydroplane fast and quick and you will be doing 360's quicker
> > than
> > > > > you can blink.
> > > > >
> > > > > The water will get under the other 3/4 of the tread and literally
lift
> > > > > you right off the road.
> > > > >
> > > > > I tested my 33x9.5's with 35 psi in them and only had 4" of tread
on
> > the
> > > > > ground. I got the best grip at 28 psi.
> > > > >
> > > > > When I used 31x10.5's they wore out perfectly even all across and
I
> > was
> > > > > running at 26 psi city, 28 highway.
> > > > >
> > > > > Now If I had those tires on a 1 ton truck and carried a load, I
would
> > > > > run them close to the top rated pressure.
> > > > >
> > > > > But a Wrangler is only a 1/4 ton truck.....
> > > > >
> > > > > Mike
> > > > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > > > 88 Cherokee 235 BFG AT's
> > > > >
> > > > > > me wrote:
> > > > > >
> > > > > > Duh, I meant to say that I have my 31x10.5x15 MT/Rs at 48 lbs.
I
> > > > > > believe the sidewall says 50 psi.
> > > > > >
> > > > > > me wrote:
> > > > > >
> > > > > > > Hold on. You guys are running 31x10.5x16 MT/Rs at 27 and 30
lbs
> > on
> > > > > > > road?? I've got 31x10.5x15 MT/Rs on my stock '98 TJ Sport and
it
> > > > > > > rides pretty nice. They are noisy even with the hard top on,
but
> > > > > > > the ride isn't so bad.
> > > > > > >
> > > > > > > Nathan Otis wrote:
> > > > > > >
> > > > > > >> I run mine at 27psi.
> > > > > > >> n.
> > > > > > >>
> > > > > > >> "bob zee" <cam509@linuxmail.org> wrote in message
> > > > > > >> news:bqq0e7$24j2kk$1@ID-177997.news.uni-berlin.de...
> > > > > > >>
> > > > > > >>
> > > > > > >> > these tires have a some info on the sidewall about max load
at
> > > > > > >> > 80psi.
> > > > > > >> > 80psi!?!?!
> > > > > > >> > great info if you want to run a max load, but what about
all of
> > > > > > >> > the other
> > > > > > >> > time?
> > > > > > >> >
> > > > > > >> > 8~)>
> > > > > > >> >
> > > > > > >> > what would you guys run in these tires? this vehicle gets
used
> > > > > > >> > for about
> > > > > > >> > 400 miles per week (200 miles of interstate and the
remainder
> > is
> > > > > > >> > rural
> > > > > > >> > highway and city).
> > > > > > >> >
> > > > > > >> > --
> > > > > > >> > bob z.
> > > > > > >> > p.s. the police aren't targetting you. *you* are making
> > > > > > >> > yourself a
> > > > > > >> >
> > > > > > >> >
> > > > > > >> target.
> > > > > > >>
> > > > > > >>
> > > > > > >> > "people with less brain power than you are doing more diffi
cult
> > > > > > >> > things
> > > > > > >> > everyday"©
> > > > > > >> >
> > > > > > >> >
> > > > > > >> >
> > > > > > >> >
> > > > > > >>
> > > > > > >>
> > > > > > >>
#86
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires-DUH!
The 9.5's don't have the lift off factor though. The wide tires over
inflated can just lift up off the ground due to the open space between
the tread and road.
Mike
CRWLR wrote:
>
> I would have thunk you knew this because you have found that your 9.50s
> prevail where guys with 12.50s have trouble. Your 9.50s are better for
> almost exactly the same reasons as overinflating.
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:3FD25AF7.D3D1FE10@sympatico.ca...
> > Interesting info, thanks.
> >
> > The tires I was thinking on were P215x60x15. They are wide and flat,
> > and those suckers lifted off at high pressure and never let go at the
> > lower proper psi, you could cruise at 70 with the traffic easy in the
> > rain.
> >
> > You are going for the wider the footprint, the lower the psi contact
> > patch is so light the whole tire floats.
> >
> > These ones just up and lost it when they hit a puddle.
> >
> > A narrow tire (7.5") like I have doesn't really have issues like a 10.5
> > or 12.5 tire.
> >
> > Your formula is based on one sized tire I think. Tall skinny sure
> > reacts to traction issues different than shorter or the same height,
> > wide tire.
> >
> > Mike
> >
> > Jerry Bransford wrote:
> > >
> > > Mike, the higher the tire pressure, the faster a tire can be driven
> without
> > > hydroplaning. That's because the narrower the footprint, the less tire
> > > surface the water can push against. That's why snow skiis wouldn't work
> for
> > > waterskiing unless you were going 90 mph. ;)
> > >
> > > A simple formula taught to pilots to determine the estimated speed at
> which
> > > a tire will hydroplane is 9 times the square root of the tire pressure
> > > equals the estimated speed a tire will hydroplane at. So for example if
> a
> > > tire were inflated to 25 psi, it would likely hydroplane somewhere near
> 45
> > > mph. If that same tire were inflated higher to 36 psi, it'd likely
> > > hydroplane at 54 mph. So the air pressure the tire is filled to is
> directly
> > > proportional to the estimated speed at which it will hydroplane at. :)
> > >
> > > Jerry
> > > --
> > > Jerry Bransford
> > > To email, remove 'me' from my email address
> > > KC6TAY, PP-ASEL
> > > See the Geezer Jeep at
> > > http://members.***.net/jerrypb/
> > >
> > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > news:3FD24818.B3B8B0B6@sympatico.ca...
> > > > I drove my brother in laws Volvo once with 60 series tires on it and
> > > > that thing couldn't go over 50 mph in a heavy rain without losing the
> > > > steering control due to hydroplaning.
> > > >
> > > > Turns out the tires were at the sidewall max pressure, not the 32 psi
> > > > recommended. The water had free space to get under the sides of the
> > > > tread lifting the tire up off the road.
> > > >
> > > > I do agree too low is bad too.
> > > >
> > > > Mike
> > > >
> > > > mabar wrote:
> > > > >
> > > > > Mike:
> > > > >
> > > > > I agree, 48 lbs. is WAY TOO MUCH pressure for that application, but
> as
> > > far
> > > > > as hydroplaning goes...
> > > > >
> > > > > A tire with lower than recommended pressure will hydroplane easier,
> > > quicker,
> > > > > and at lower speeds.
> > > > >
> > > > > A tire with higher than recommended pressure will hydroplane less,
> and
> > > > > usually at higher speeds.
> > > > >
> > > > > Tom
> > > > >
> > > > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > > > news:3FD234FC.A668B58@sympatico.ca...
> > > > > > That is actually pretty dangerous.....
> > > > > >
> > > > > > At that pressure you only have about 1/4 of your tread actually
> > > touching
> > > > > > the road when you drive straight.
> > > > > >
> > > > > > This can lead to a fast end to end swap if you hit water or snow.
> > > They
> > > > > > will hydroplane fast and quick and you will be doing 360's quicker
> > > than
> > > > > > you can blink.
> > > > > >
> > > > > > The water will get under the other 3/4 of the tread and literally
> lift
> > > > > > you right off the road.
> > > > > >
> > > > > > I tested my 33x9.5's with 35 psi in them and only had 4" of tread
> on
> > > the
> > > > > > ground. I got the best grip at 28 psi.
> > > > > >
> > > > > > When I used 31x10.5's they wore out perfectly even all across and
> I
> > > was
> > > > > > running at 26 psi city, 28 highway.
> > > > > >
> > > > > > Now If I had those tires on a 1 ton truck and carried a load, I
> would
> > > > > > run them close to the top rated pressure.
> > > > > >
> > > > > > But a Wrangler is only a 1/4 ton truck.....
> > > > > >
> > > > > > Mike
> > > > > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > > > > 88 Cherokee 235 BFG AT's
> > > > > >
> > > > > > > me wrote:
> > > > > > >
> > > > > > > Duh, I meant to say that I have my 31x10.5x15 MT/Rs at 48 lbs.
> I
> > > > > > > believe the sidewall says 50 psi.
> > > > > > >
> > > > > > > me wrote:
> > > > > > >
> > > > > > > > Hold on. You guys are running 31x10.5x16 MT/Rs at 27 and 30
> lbs
> > > on
> > > > > > > > road?? I've got 31x10.5x15 MT/Rs on my stock '98 TJ Sport and
> it
> > > > > > > > rides pretty nice. They are noisy even with the hard top on,
> but
> > > > > > > > the ride isn't so bad.
> > > > > > > >
> > > > > > > > Nathan Otis wrote:
> > > > > > > >
> > > > > > > >> I run mine at 27psi.
> > > > > > > >> n.
> > > > > > > >>
> > > > > > > >> "bob zee" <cam509@linuxmail.org> wrote in message
> > > > > > > >> news:bqq0e7$24j2kk$1@ID-177997.news.uni-berlin.de...
> > > > > > > >>
> > > > > > > >>
> > > > > > > >> > these tires have a some info on the sidewall about max load
> at
> > > > > > > >> > 80psi.
> > > > > > > >> > 80psi!?!?!
> > > > > > > >> > great info if you want to run a max load, but what about
> all of
> > > > > > > >> > the other
> > > > > > > >> > time?
> > > > > > > >> >
> > > > > > > >> > 8~)>
> > > > > > > >> >
> > > > > > > >> > what would you guys run in these tires? this vehicle gets
> used
> > > > > > > >> > for about
> > > > > > > >> > 400 miles per week (200 miles of interstate and the
> remainder
> > > is
> > > > > > > >> > rural
> > > > > > > >> > highway and city).
> > > > > > > >> >
> > > > > > > >> > --
> > > > > > > >> > bob z.
> > > > > > > >> > p.s. the police aren't targetting you. *you* are making
> > > > > > > >> > yourself a
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >> target.
> > > > > > > >>
> > > > > > > >>
> > > > > > > >> > "people with less brain power than you are doing more diffi
> cult
> > > > > > > >> > things
> > > > > > > >> > everyday"©
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >>
> > > > > > > >>
> > > > > > > >>
inflated can just lift up off the ground due to the open space between
the tread and road.
Mike
CRWLR wrote:
>
> I would have thunk you knew this because you have found that your 9.50s
> prevail where guys with 12.50s have trouble. Your 9.50s are better for
> almost exactly the same reasons as overinflating.
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:3FD25AF7.D3D1FE10@sympatico.ca...
> > Interesting info, thanks.
> >
> > The tires I was thinking on were P215x60x15. They are wide and flat,
> > and those suckers lifted off at high pressure and never let go at the
> > lower proper psi, you could cruise at 70 with the traffic easy in the
> > rain.
> >
> > You are going for the wider the footprint, the lower the psi contact
> > patch is so light the whole tire floats.
> >
> > These ones just up and lost it when they hit a puddle.
> >
> > A narrow tire (7.5") like I have doesn't really have issues like a 10.5
> > or 12.5 tire.
> >
> > Your formula is based on one sized tire I think. Tall skinny sure
> > reacts to traction issues different than shorter or the same height,
> > wide tire.
> >
> > Mike
> >
> > Jerry Bransford wrote:
> > >
> > > Mike, the higher the tire pressure, the faster a tire can be driven
> without
> > > hydroplaning. That's because the narrower the footprint, the less tire
> > > surface the water can push against. That's why snow skiis wouldn't work
> for
> > > waterskiing unless you were going 90 mph. ;)
> > >
> > > A simple formula taught to pilots to determine the estimated speed at
> which
> > > a tire will hydroplane is 9 times the square root of the tire pressure
> > > equals the estimated speed a tire will hydroplane at. So for example if
> a
> > > tire were inflated to 25 psi, it would likely hydroplane somewhere near
> 45
> > > mph. If that same tire were inflated higher to 36 psi, it'd likely
> > > hydroplane at 54 mph. So the air pressure the tire is filled to is
> directly
> > > proportional to the estimated speed at which it will hydroplane at. :)
> > >
> > > Jerry
> > > --
> > > Jerry Bransford
> > > To email, remove 'me' from my email address
> > > KC6TAY, PP-ASEL
> > > See the Geezer Jeep at
> > > http://members.***.net/jerrypb/
> > >
> > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > news:3FD24818.B3B8B0B6@sympatico.ca...
> > > > I drove my brother in laws Volvo once with 60 series tires on it and
> > > > that thing couldn't go over 50 mph in a heavy rain without losing the
> > > > steering control due to hydroplaning.
> > > >
> > > > Turns out the tires were at the sidewall max pressure, not the 32 psi
> > > > recommended. The water had free space to get under the sides of the
> > > > tread lifting the tire up off the road.
> > > >
> > > > I do agree too low is bad too.
> > > >
> > > > Mike
> > > >
> > > > mabar wrote:
> > > > >
> > > > > Mike:
> > > > >
> > > > > I agree, 48 lbs. is WAY TOO MUCH pressure for that application, but
> as
> > > far
> > > > > as hydroplaning goes...
> > > > >
> > > > > A tire with lower than recommended pressure will hydroplane easier,
> > > quicker,
> > > > > and at lower speeds.
> > > > >
> > > > > A tire with higher than recommended pressure will hydroplane less,
> and
> > > > > usually at higher speeds.
> > > > >
> > > > > Tom
> > > > >
> > > > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > > > news:3FD234FC.A668B58@sympatico.ca...
> > > > > > That is actually pretty dangerous.....
> > > > > >
> > > > > > At that pressure you only have about 1/4 of your tread actually
> > > touching
> > > > > > the road when you drive straight.
> > > > > >
> > > > > > This can lead to a fast end to end swap if you hit water or snow.
> > > They
> > > > > > will hydroplane fast and quick and you will be doing 360's quicker
> > > than
> > > > > > you can blink.
> > > > > >
> > > > > > The water will get under the other 3/4 of the tread and literally
> lift
> > > > > > you right off the road.
> > > > > >
> > > > > > I tested my 33x9.5's with 35 psi in them and only had 4" of tread
> on
> > > the
> > > > > > ground. I got the best grip at 28 psi.
> > > > > >
> > > > > > When I used 31x10.5's they wore out perfectly even all across and
> I
> > > was
> > > > > > running at 26 psi city, 28 highway.
> > > > > >
> > > > > > Now If I had those tires on a 1 ton truck and carried a load, I
> would
> > > > > > run them close to the top rated pressure.
> > > > > >
> > > > > > But a Wrangler is only a 1/4 ton truck.....
> > > > > >
> > > > > > Mike
> > > > > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > > > > 88 Cherokee 235 BFG AT's
> > > > > >
> > > > > > > me wrote:
> > > > > > >
> > > > > > > Duh, I meant to say that I have my 31x10.5x15 MT/Rs at 48 lbs.
> I
> > > > > > > believe the sidewall says 50 psi.
> > > > > > >
> > > > > > > me wrote:
> > > > > > >
> > > > > > > > Hold on. You guys are running 31x10.5x16 MT/Rs at 27 and 30
> lbs
> > > on
> > > > > > > > road?? I've got 31x10.5x15 MT/Rs on my stock '98 TJ Sport and
> it
> > > > > > > > rides pretty nice. They are noisy even with the hard top on,
> but
> > > > > > > > the ride isn't so bad.
> > > > > > > >
> > > > > > > > Nathan Otis wrote:
> > > > > > > >
> > > > > > > >> I run mine at 27psi.
> > > > > > > >> n.
> > > > > > > >>
> > > > > > > >> "bob zee" <cam509@linuxmail.org> wrote in message
> > > > > > > >> news:bqq0e7$24j2kk$1@ID-177997.news.uni-berlin.de...
> > > > > > > >>
> > > > > > > >>
> > > > > > > >> > these tires have a some info on the sidewall about max load
> at
> > > > > > > >> > 80psi.
> > > > > > > >> > 80psi!?!?!
> > > > > > > >> > great info if you want to run a max load, but what about
> all of
> > > > > > > >> > the other
> > > > > > > >> > time?
> > > > > > > >> >
> > > > > > > >> > 8~)>
> > > > > > > >> >
> > > > > > > >> > what would you guys run in these tires? this vehicle gets
> used
> > > > > > > >> > for about
> > > > > > > >> > 400 miles per week (200 miles of interstate and the
> remainder
> > > is
> > > > > > > >> > rural
> > > > > > > >> > highway and city).
> > > > > > > >> >
> > > > > > > >> > --
> > > > > > > >> > bob z.
> > > > > > > >> > p.s. the police aren't targetting you. *you* are making
> > > > > > > >> > yourself a
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >> target.
> > > > > > > >>
> > > > > > > >>
> > > > > > > >> > "people with less brain power than you are doing more diffi
> cult
> > > > > > > >> > things
> > > > > > > >> > everyday"©
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >>
> > > > > > > >>
> > > > > > > >>
#87
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires-DUH!
The 9.5's don't have the lift off factor though. The wide tires over
inflated can just lift up off the ground due to the open space between
the tread and road.
Mike
CRWLR wrote:
>
> I would have thunk you knew this because you have found that your 9.50s
> prevail where guys with 12.50s have trouble. Your 9.50s are better for
> almost exactly the same reasons as overinflating.
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:3FD25AF7.D3D1FE10@sympatico.ca...
> > Interesting info, thanks.
> >
> > The tires I was thinking on were P215x60x15. They are wide and flat,
> > and those suckers lifted off at high pressure and never let go at the
> > lower proper psi, you could cruise at 70 with the traffic easy in the
> > rain.
> >
> > You are going for the wider the footprint, the lower the psi contact
> > patch is so light the whole tire floats.
> >
> > These ones just up and lost it when they hit a puddle.
> >
> > A narrow tire (7.5") like I have doesn't really have issues like a 10.5
> > or 12.5 tire.
> >
> > Your formula is based on one sized tire I think. Tall skinny sure
> > reacts to traction issues different than shorter or the same height,
> > wide tire.
> >
> > Mike
> >
> > Jerry Bransford wrote:
> > >
> > > Mike, the higher the tire pressure, the faster a tire can be driven
> without
> > > hydroplaning. That's because the narrower the footprint, the less tire
> > > surface the water can push against. That's why snow skiis wouldn't work
> for
> > > waterskiing unless you were going 90 mph. ;)
> > >
> > > A simple formula taught to pilots to determine the estimated speed at
> which
> > > a tire will hydroplane is 9 times the square root of the tire pressure
> > > equals the estimated speed a tire will hydroplane at. So for example if
> a
> > > tire were inflated to 25 psi, it would likely hydroplane somewhere near
> 45
> > > mph. If that same tire were inflated higher to 36 psi, it'd likely
> > > hydroplane at 54 mph. So the air pressure the tire is filled to is
> directly
> > > proportional to the estimated speed at which it will hydroplane at. :)
> > >
> > > Jerry
> > > --
> > > Jerry Bransford
> > > To email, remove 'me' from my email address
> > > KC6TAY, PP-ASEL
> > > See the Geezer Jeep at
> > > http://members.***.net/jerrypb/
> > >
> > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > news:3FD24818.B3B8B0B6@sympatico.ca...
> > > > I drove my brother in laws Volvo once with 60 series tires on it and
> > > > that thing couldn't go over 50 mph in a heavy rain without losing the
> > > > steering control due to hydroplaning.
> > > >
> > > > Turns out the tires were at the sidewall max pressure, not the 32 psi
> > > > recommended. The water had free space to get under the sides of the
> > > > tread lifting the tire up off the road.
> > > >
> > > > I do agree too low is bad too.
> > > >
> > > > Mike
> > > >
> > > > mabar wrote:
> > > > >
> > > > > Mike:
> > > > >
> > > > > I agree, 48 lbs. is WAY TOO MUCH pressure for that application, but
> as
> > > far
> > > > > as hydroplaning goes...
> > > > >
> > > > > A tire with lower than recommended pressure will hydroplane easier,
> > > quicker,
> > > > > and at lower speeds.
> > > > >
> > > > > A tire with higher than recommended pressure will hydroplane less,
> and
> > > > > usually at higher speeds.
> > > > >
> > > > > Tom
> > > > >
> > > > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > > > news:3FD234FC.A668B58@sympatico.ca...
> > > > > > That is actually pretty dangerous.....
> > > > > >
> > > > > > At that pressure you only have about 1/4 of your tread actually
> > > touching
> > > > > > the road when you drive straight.
> > > > > >
> > > > > > This can lead to a fast end to end swap if you hit water or snow.
> > > They
> > > > > > will hydroplane fast and quick and you will be doing 360's quicker
> > > than
> > > > > > you can blink.
> > > > > >
> > > > > > The water will get under the other 3/4 of the tread and literally
> lift
> > > > > > you right off the road.
> > > > > >
> > > > > > I tested my 33x9.5's with 35 psi in them and only had 4" of tread
> on
> > > the
> > > > > > ground. I got the best grip at 28 psi.
> > > > > >
> > > > > > When I used 31x10.5's they wore out perfectly even all across and
> I
> > > was
> > > > > > running at 26 psi city, 28 highway.
> > > > > >
> > > > > > Now If I had those tires on a 1 ton truck and carried a load, I
> would
> > > > > > run them close to the top rated pressure.
> > > > > >
> > > > > > But a Wrangler is only a 1/4 ton truck.....
> > > > > >
> > > > > > Mike
> > > > > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > > > > 88 Cherokee 235 BFG AT's
> > > > > >
> > > > > > > me wrote:
> > > > > > >
> > > > > > > Duh, I meant to say that I have my 31x10.5x15 MT/Rs at 48 lbs.
> I
> > > > > > > believe the sidewall says 50 psi.
> > > > > > >
> > > > > > > me wrote:
> > > > > > >
> > > > > > > > Hold on. You guys are running 31x10.5x16 MT/Rs at 27 and 30
> lbs
> > > on
> > > > > > > > road?? I've got 31x10.5x15 MT/Rs on my stock '98 TJ Sport and
> it
> > > > > > > > rides pretty nice. They are noisy even with the hard top on,
> but
> > > > > > > > the ride isn't so bad.
> > > > > > > >
> > > > > > > > Nathan Otis wrote:
> > > > > > > >
> > > > > > > >> I run mine at 27psi.
> > > > > > > >> n.
> > > > > > > >>
> > > > > > > >> "bob zee" <cam509@linuxmail.org> wrote in message
> > > > > > > >> news:bqq0e7$24j2kk$1@ID-177997.news.uni-berlin.de...
> > > > > > > >>
> > > > > > > >>
> > > > > > > >> > these tires have a some info on the sidewall about max load
> at
> > > > > > > >> > 80psi.
> > > > > > > >> > 80psi!?!?!
> > > > > > > >> > great info if you want to run a max load, but what about
> all of
> > > > > > > >> > the other
> > > > > > > >> > time?
> > > > > > > >> >
> > > > > > > >> > 8~)>
> > > > > > > >> >
> > > > > > > >> > what would you guys run in these tires? this vehicle gets
> used
> > > > > > > >> > for about
> > > > > > > >> > 400 miles per week (200 miles of interstate and the
> remainder
> > > is
> > > > > > > >> > rural
> > > > > > > >> > highway and city).
> > > > > > > >> >
> > > > > > > >> > --
> > > > > > > >> > bob z.
> > > > > > > >> > p.s. the police aren't targetting you. *you* are making
> > > > > > > >> > yourself a
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >> target.
> > > > > > > >>
> > > > > > > >>
> > > > > > > >> > "people with less brain power than you are doing more diffi
> cult
> > > > > > > >> > things
> > > > > > > >> > everyday"©
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >>
> > > > > > > >>
> > > > > > > >>
inflated can just lift up off the ground due to the open space between
the tread and road.
Mike
CRWLR wrote:
>
> I would have thunk you knew this because you have found that your 9.50s
> prevail where guys with 12.50s have trouble. Your 9.50s are better for
> almost exactly the same reasons as overinflating.
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:3FD25AF7.D3D1FE10@sympatico.ca...
> > Interesting info, thanks.
> >
> > The tires I was thinking on were P215x60x15. They are wide and flat,
> > and those suckers lifted off at high pressure and never let go at the
> > lower proper psi, you could cruise at 70 with the traffic easy in the
> > rain.
> >
> > You are going for the wider the footprint, the lower the psi contact
> > patch is so light the whole tire floats.
> >
> > These ones just up and lost it when they hit a puddle.
> >
> > A narrow tire (7.5") like I have doesn't really have issues like a 10.5
> > or 12.5 tire.
> >
> > Your formula is based on one sized tire I think. Tall skinny sure
> > reacts to traction issues different than shorter or the same height,
> > wide tire.
> >
> > Mike
> >
> > Jerry Bransford wrote:
> > >
> > > Mike, the higher the tire pressure, the faster a tire can be driven
> without
> > > hydroplaning. That's because the narrower the footprint, the less tire
> > > surface the water can push against. That's why snow skiis wouldn't work
> for
> > > waterskiing unless you were going 90 mph. ;)
> > >
> > > A simple formula taught to pilots to determine the estimated speed at
> which
> > > a tire will hydroplane is 9 times the square root of the tire pressure
> > > equals the estimated speed a tire will hydroplane at. So for example if
> a
> > > tire were inflated to 25 psi, it would likely hydroplane somewhere near
> 45
> > > mph. If that same tire were inflated higher to 36 psi, it'd likely
> > > hydroplane at 54 mph. So the air pressure the tire is filled to is
> directly
> > > proportional to the estimated speed at which it will hydroplane at. :)
> > >
> > > Jerry
> > > --
> > > Jerry Bransford
> > > To email, remove 'me' from my email address
> > > KC6TAY, PP-ASEL
> > > See the Geezer Jeep at
> > > http://members.***.net/jerrypb/
> > >
> > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > news:3FD24818.B3B8B0B6@sympatico.ca...
> > > > I drove my brother in laws Volvo once with 60 series tires on it and
> > > > that thing couldn't go over 50 mph in a heavy rain without losing the
> > > > steering control due to hydroplaning.
> > > >
> > > > Turns out the tires were at the sidewall max pressure, not the 32 psi
> > > > recommended. The water had free space to get under the sides of the
> > > > tread lifting the tire up off the road.
> > > >
> > > > I do agree too low is bad too.
> > > >
> > > > Mike
> > > >
> > > > mabar wrote:
> > > > >
> > > > > Mike:
> > > > >
> > > > > I agree, 48 lbs. is WAY TOO MUCH pressure for that application, but
> as
> > > far
> > > > > as hydroplaning goes...
> > > > >
> > > > > A tire with lower than recommended pressure will hydroplane easier,
> > > quicker,
> > > > > and at lower speeds.
> > > > >
> > > > > A tire with higher than recommended pressure will hydroplane less,
> and
> > > > > usually at higher speeds.
> > > > >
> > > > > Tom
> > > > >
> > > > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > > > news:3FD234FC.A668B58@sympatico.ca...
> > > > > > That is actually pretty dangerous.....
> > > > > >
> > > > > > At that pressure you only have about 1/4 of your tread actually
> > > touching
> > > > > > the road when you drive straight.
> > > > > >
> > > > > > This can lead to a fast end to end swap if you hit water or snow.
> > > They
> > > > > > will hydroplane fast and quick and you will be doing 360's quicker
> > > than
> > > > > > you can blink.
> > > > > >
> > > > > > The water will get under the other 3/4 of the tread and literally
> lift
> > > > > > you right off the road.
> > > > > >
> > > > > > I tested my 33x9.5's with 35 psi in them and only had 4" of tread
> on
> > > the
> > > > > > ground. I got the best grip at 28 psi.
> > > > > >
> > > > > > When I used 31x10.5's they wore out perfectly even all across and
> I
> > > was
> > > > > > running at 26 psi city, 28 highway.
> > > > > >
> > > > > > Now If I had those tires on a 1 ton truck and carried a load, I
> would
> > > > > > run them close to the top rated pressure.
> > > > > >
> > > > > > But a Wrangler is only a 1/4 ton truck.....
> > > > > >
> > > > > > Mike
> > > > > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > > > > 88 Cherokee 235 BFG AT's
> > > > > >
> > > > > > > me wrote:
> > > > > > >
> > > > > > > Duh, I meant to say that I have my 31x10.5x15 MT/Rs at 48 lbs.
> I
> > > > > > > believe the sidewall says 50 psi.
> > > > > > >
> > > > > > > me wrote:
> > > > > > >
> > > > > > > > Hold on. You guys are running 31x10.5x16 MT/Rs at 27 and 30
> lbs
> > > on
> > > > > > > > road?? I've got 31x10.5x15 MT/Rs on my stock '98 TJ Sport and
> it
> > > > > > > > rides pretty nice. They are noisy even with the hard top on,
> but
> > > > > > > > the ride isn't so bad.
> > > > > > > >
> > > > > > > > Nathan Otis wrote:
> > > > > > > >
> > > > > > > >> I run mine at 27psi.
> > > > > > > >> n.
> > > > > > > >>
> > > > > > > >> "bob zee" <cam509@linuxmail.org> wrote in message
> > > > > > > >> news:bqq0e7$24j2kk$1@ID-177997.news.uni-berlin.de...
> > > > > > > >>
> > > > > > > >>
> > > > > > > >> > these tires have a some info on the sidewall about max load
> at
> > > > > > > >> > 80psi.
> > > > > > > >> > 80psi!?!?!
> > > > > > > >> > great info if you want to run a max load, but what about
> all of
> > > > > > > >> > the other
> > > > > > > >> > time?
> > > > > > > >> >
> > > > > > > >> > 8~)>
> > > > > > > >> >
> > > > > > > >> > what would you guys run in these tires? this vehicle gets
> used
> > > > > > > >> > for about
> > > > > > > >> > 400 miles per week (200 miles of interstate and the
> remainder
> > > is
> > > > > > > >> > rural
> > > > > > > >> > highway and city).
> > > > > > > >> >
> > > > > > > >> > --
> > > > > > > >> > bob z.
> > > > > > > >> > p.s. the police aren't targetting you. *you* are making
> > > > > > > >> > yourself a
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >> target.
> > > > > > > >>
> > > > > > > >>
> > > > > > > >> > "people with less brain power than you are doing more diffi
> cult
> > > > > > > >> > things
> > > > > > > >> > everyday"©
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >>
> > > > > > > >>
> > > > > > > >>
#88
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires-DUH!
The 9.5's don't have the lift off factor though. The wide tires over
inflated can just lift up off the ground due to the open space between
the tread and road.
Mike
CRWLR wrote:
>
> I would have thunk you knew this because you have found that your 9.50s
> prevail where guys with 12.50s have trouble. Your 9.50s are better for
> almost exactly the same reasons as overinflating.
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:3FD25AF7.D3D1FE10@sympatico.ca...
> > Interesting info, thanks.
> >
> > The tires I was thinking on were P215x60x15. They are wide and flat,
> > and those suckers lifted off at high pressure and never let go at the
> > lower proper psi, you could cruise at 70 with the traffic easy in the
> > rain.
> >
> > You are going for the wider the footprint, the lower the psi contact
> > patch is so light the whole tire floats.
> >
> > These ones just up and lost it when they hit a puddle.
> >
> > A narrow tire (7.5") like I have doesn't really have issues like a 10.5
> > or 12.5 tire.
> >
> > Your formula is based on one sized tire I think. Tall skinny sure
> > reacts to traction issues different than shorter or the same height,
> > wide tire.
> >
> > Mike
> >
> > Jerry Bransford wrote:
> > >
> > > Mike, the higher the tire pressure, the faster a tire can be driven
> without
> > > hydroplaning. That's because the narrower the footprint, the less tire
> > > surface the water can push against. That's why snow skiis wouldn't work
> for
> > > waterskiing unless you were going 90 mph. ;)
> > >
> > > A simple formula taught to pilots to determine the estimated speed at
> which
> > > a tire will hydroplane is 9 times the square root of the tire pressure
> > > equals the estimated speed a tire will hydroplane at. So for example if
> a
> > > tire were inflated to 25 psi, it would likely hydroplane somewhere near
> 45
> > > mph. If that same tire were inflated higher to 36 psi, it'd likely
> > > hydroplane at 54 mph. So the air pressure the tire is filled to is
> directly
> > > proportional to the estimated speed at which it will hydroplane at. :)
> > >
> > > Jerry
> > > --
> > > Jerry Bransford
> > > To email, remove 'me' from my email address
> > > KC6TAY, PP-ASEL
> > > See the Geezer Jeep at
> > > http://members.***.net/jerrypb/
> > >
> > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > news:3FD24818.B3B8B0B6@sympatico.ca...
> > > > I drove my brother in laws Volvo once with 60 series tires on it and
> > > > that thing couldn't go over 50 mph in a heavy rain without losing the
> > > > steering control due to hydroplaning.
> > > >
> > > > Turns out the tires were at the sidewall max pressure, not the 32 psi
> > > > recommended. The water had free space to get under the sides of the
> > > > tread lifting the tire up off the road.
> > > >
> > > > I do agree too low is bad too.
> > > >
> > > > Mike
> > > >
> > > > mabar wrote:
> > > > >
> > > > > Mike:
> > > > >
> > > > > I agree, 48 lbs. is WAY TOO MUCH pressure for that application, but
> as
> > > far
> > > > > as hydroplaning goes...
> > > > >
> > > > > A tire with lower than recommended pressure will hydroplane easier,
> > > quicker,
> > > > > and at lower speeds.
> > > > >
> > > > > A tire with higher than recommended pressure will hydroplane less,
> and
> > > > > usually at higher speeds.
> > > > >
> > > > > Tom
> > > > >
> > > > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > > > news:3FD234FC.A668B58@sympatico.ca...
> > > > > > That is actually pretty dangerous.....
> > > > > >
> > > > > > At that pressure you only have about 1/4 of your tread actually
> > > touching
> > > > > > the road when you drive straight.
> > > > > >
> > > > > > This can lead to a fast end to end swap if you hit water or snow.
> > > They
> > > > > > will hydroplane fast and quick and you will be doing 360's quicker
> > > than
> > > > > > you can blink.
> > > > > >
> > > > > > The water will get under the other 3/4 of the tread and literally
> lift
> > > > > > you right off the road.
> > > > > >
> > > > > > I tested my 33x9.5's with 35 psi in them and only had 4" of tread
> on
> > > the
> > > > > > ground. I got the best grip at 28 psi.
> > > > > >
> > > > > > When I used 31x10.5's they wore out perfectly even all across and
> I
> > > was
> > > > > > running at 26 psi city, 28 highway.
> > > > > >
> > > > > > Now If I had those tires on a 1 ton truck and carried a load, I
> would
> > > > > > run them close to the top rated pressure.
> > > > > >
> > > > > > But a Wrangler is only a 1/4 ton truck.....
> > > > > >
> > > > > > Mike
> > > > > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > > > > 88 Cherokee 235 BFG AT's
> > > > > >
> > > > > > > me wrote:
> > > > > > >
> > > > > > > Duh, I meant to say that I have my 31x10.5x15 MT/Rs at 48 lbs.
> I
> > > > > > > believe the sidewall says 50 psi.
> > > > > > >
> > > > > > > me wrote:
> > > > > > >
> > > > > > > > Hold on. You guys are running 31x10.5x16 MT/Rs at 27 and 30
> lbs
> > > on
> > > > > > > > road?? I've got 31x10.5x15 MT/Rs on my stock '98 TJ Sport and
> it
> > > > > > > > rides pretty nice. They are noisy even with the hard top on,
> but
> > > > > > > > the ride isn't so bad.
> > > > > > > >
> > > > > > > > Nathan Otis wrote:
> > > > > > > >
> > > > > > > >> I run mine at 27psi.
> > > > > > > >> n.
> > > > > > > >>
> > > > > > > >> "bob zee" <cam509@linuxmail.org> wrote in message
> > > > > > > >> news:bqq0e7$24j2kk$1@ID-177997.news.uni-berlin.de...
> > > > > > > >>
> > > > > > > >>
> > > > > > > >> > these tires have a some info on the sidewall about max load
> at
> > > > > > > >> > 80psi.
> > > > > > > >> > 80psi!?!?!
> > > > > > > >> > great info if you want to run a max load, but what about
> all of
> > > > > > > >> > the other
> > > > > > > >> > time?
> > > > > > > >> >
> > > > > > > >> > 8~)>
> > > > > > > >> >
> > > > > > > >> > what would you guys run in these tires? this vehicle gets
> used
> > > > > > > >> > for about
> > > > > > > >> > 400 miles per week (200 miles of interstate and the
> remainder
> > > is
> > > > > > > >> > rural
> > > > > > > >> > highway and city).
> > > > > > > >> >
> > > > > > > >> > --
> > > > > > > >> > bob z.
> > > > > > > >> > p.s. the police aren't targetting you. *you* are making
> > > > > > > >> > yourself a
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >> target.
> > > > > > > >>
> > > > > > > >>
> > > > > > > >> > "people with less brain power than you are doing more diffi
> cult
> > > > > > > >> > things
> > > > > > > >> > everyday"©
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >>
> > > > > > > >>
> > > > > > > >>
inflated can just lift up off the ground due to the open space between
the tread and road.
Mike
CRWLR wrote:
>
> I would have thunk you knew this because you have found that your 9.50s
> prevail where guys with 12.50s have trouble. Your 9.50s are better for
> almost exactly the same reasons as overinflating.
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:3FD25AF7.D3D1FE10@sympatico.ca...
> > Interesting info, thanks.
> >
> > The tires I was thinking on were P215x60x15. They are wide and flat,
> > and those suckers lifted off at high pressure and never let go at the
> > lower proper psi, you could cruise at 70 with the traffic easy in the
> > rain.
> >
> > You are going for the wider the footprint, the lower the psi contact
> > patch is so light the whole tire floats.
> >
> > These ones just up and lost it when they hit a puddle.
> >
> > A narrow tire (7.5") like I have doesn't really have issues like a 10.5
> > or 12.5 tire.
> >
> > Your formula is based on one sized tire I think. Tall skinny sure
> > reacts to traction issues different than shorter or the same height,
> > wide tire.
> >
> > Mike
> >
> > Jerry Bransford wrote:
> > >
> > > Mike, the higher the tire pressure, the faster a tire can be driven
> without
> > > hydroplaning. That's because the narrower the footprint, the less tire
> > > surface the water can push against. That's why snow skiis wouldn't work
> for
> > > waterskiing unless you were going 90 mph. ;)
> > >
> > > A simple formula taught to pilots to determine the estimated speed at
> which
> > > a tire will hydroplane is 9 times the square root of the tire pressure
> > > equals the estimated speed a tire will hydroplane at. So for example if
> a
> > > tire were inflated to 25 psi, it would likely hydroplane somewhere near
> 45
> > > mph. If that same tire were inflated higher to 36 psi, it'd likely
> > > hydroplane at 54 mph. So the air pressure the tire is filled to is
> directly
> > > proportional to the estimated speed at which it will hydroplane at. :)
> > >
> > > Jerry
> > > --
> > > Jerry Bransford
> > > To email, remove 'me' from my email address
> > > KC6TAY, PP-ASEL
> > > See the Geezer Jeep at
> > > http://members.***.net/jerrypb/
> > >
> > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > news:3FD24818.B3B8B0B6@sympatico.ca...
> > > > I drove my brother in laws Volvo once with 60 series tires on it and
> > > > that thing couldn't go over 50 mph in a heavy rain without losing the
> > > > steering control due to hydroplaning.
> > > >
> > > > Turns out the tires were at the sidewall max pressure, not the 32 psi
> > > > recommended. The water had free space to get under the sides of the
> > > > tread lifting the tire up off the road.
> > > >
> > > > I do agree too low is bad too.
> > > >
> > > > Mike
> > > >
> > > > mabar wrote:
> > > > >
> > > > > Mike:
> > > > >
> > > > > I agree, 48 lbs. is WAY TOO MUCH pressure for that application, but
> as
> > > far
> > > > > as hydroplaning goes...
> > > > >
> > > > > A tire with lower than recommended pressure will hydroplane easier,
> > > quicker,
> > > > > and at lower speeds.
> > > > >
> > > > > A tire with higher than recommended pressure will hydroplane less,
> and
> > > > > usually at higher speeds.
> > > > >
> > > > > Tom
> > > > >
> > > > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > > > news:3FD234FC.A668B58@sympatico.ca...
> > > > > > That is actually pretty dangerous.....
> > > > > >
> > > > > > At that pressure you only have about 1/4 of your tread actually
> > > touching
> > > > > > the road when you drive straight.
> > > > > >
> > > > > > This can lead to a fast end to end swap if you hit water or snow.
> > > They
> > > > > > will hydroplane fast and quick and you will be doing 360's quicker
> > > than
> > > > > > you can blink.
> > > > > >
> > > > > > The water will get under the other 3/4 of the tread and literally
> lift
> > > > > > you right off the road.
> > > > > >
> > > > > > I tested my 33x9.5's with 35 psi in them and only had 4" of tread
> on
> > > the
> > > > > > ground. I got the best grip at 28 psi.
> > > > > >
> > > > > > When I used 31x10.5's they wore out perfectly even all across and
> I
> > > was
> > > > > > running at 26 psi city, 28 highway.
> > > > > >
> > > > > > Now If I had those tires on a 1 ton truck and carried a load, I
> would
> > > > > > run them close to the top rated pressure.
> > > > > >
> > > > > > But a Wrangler is only a 1/4 ton truck.....
> > > > > >
> > > > > > Mike
> > > > > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > > > > 88 Cherokee 235 BFG AT's
> > > > > >
> > > > > > > me wrote:
> > > > > > >
> > > > > > > Duh, I meant to say that I have my 31x10.5x15 MT/Rs at 48 lbs.
> I
> > > > > > > believe the sidewall says 50 psi.
> > > > > > >
> > > > > > > me wrote:
> > > > > > >
> > > > > > > > Hold on. You guys are running 31x10.5x16 MT/Rs at 27 and 30
> lbs
> > > on
> > > > > > > > road?? I've got 31x10.5x15 MT/Rs on my stock '98 TJ Sport and
> it
> > > > > > > > rides pretty nice. They are noisy even with the hard top on,
> but
> > > > > > > > the ride isn't so bad.
> > > > > > > >
> > > > > > > > Nathan Otis wrote:
> > > > > > > >
> > > > > > > >> I run mine at 27psi.
> > > > > > > >> n.
> > > > > > > >>
> > > > > > > >> "bob zee" <cam509@linuxmail.org> wrote in message
> > > > > > > >> news:bqq0e7$24j2kk$1@ID-177997.news.uni-berlin.de...
> > > > > > > >>
> > > > > > > >>
> > > > > > > >> > these tires have a some info on the sidewall about max load
> at
> > > > > > > >> > 80psi.
> > > > > > > >> > 80psi!?!?!
> > > > > > > >> > great info if you want to run a max load, but what about
> all of
> > > > > > > >> > the other
> > > > > > > >> > time?
> > > > > > > >> >
> > > > > > > >> > 8~)>
> > > > > > > >> >
> > > > > > > >> > what would you guys run in these tires? this vehicle gets
> used
> > > > > > > >> > for about
> > > > > > > >> > 400 miles per week (200 miles of interstate and the
> remainder
> > > is
> > > > > > > >> > rural
> > > > > > > >> > highway and city).
> > > > > > > >> >
> > > > > > > >> > --
> > > > > > > >> > bob z.
> > > > > > > >> > p.s. the police aren't targetting you. *you* are making
> > > > > > > >> > yourself a
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >> target.
> > > > > > > >>
> > > > > > > >>
> > > > > > > >> > "people with less brain power than you are doing more diffi
> cult
> > > > > > > >> > things
> > > > > > > >> > everyday"©
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >> >
> > > > > > > >>
> > > > > > > >>
> > > > > > > >>
#89
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires-DUH!
Thin tires will not hydroplane as easily as wide tires, and wide tires that
are over inflated are narrower than wide tires that are properly or under
inflated.
I think I get your point though. If the wide tires are over inflated, then
there is an opportunity for some portion of the tread to be lifted on a thin
film of water, setting up the conditions for hydroplaning perhaps even
earlier than might otherwise happen.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3FD3EF27.B7E400A7@sympatico.ca...
> The 9.5's don't have the lift off factor though. The wide tires over
> inflated can just lift up off the ground due to the open space between
> the tread and road.
>
> Mike
>
> CRWLR wrote:
> >
> > I would have thunk you knew this because you have found that your 9.50s
> > prevail where guys with 12.50s have trouble. Your 9.50s are better for
> > almost exactly the same reasons as overinflating.
> >
> > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > news:3FD25AF7.D3D1FE10@sympatico.ca...
> > > Interesting info, thanks.
> > >
> > > The tires I was thinking on were P215x60x15. They are wide and flat,
> > > and those suckers lifted off at high pressure and never let go at the
> > > lower proper psi, you could cruise at 70 with the traffic easy in the
> > > rain.
> > >
> > > You are going for the wider the footprint, the lower the psi contact
> > > patch is so light the whole tire floats.
> > >
> > > These ones just up and lost it when they hit a puddle.
> > >
> > > A narrow tire (7.5") like I have doesn't really have issues like a
10.5
> > > or 12.5 tire.
> > >
> > > Your formula is based on one sized tire I think. Tall skinny sure
> > > reacts to traction issues different than shorter or the same height,
> > > wide tire.
> > >
> > > Mike
> > >
> > > Jerry Bransford wrote:
> > > >
> > > > Mike, the higher the tire pressure, the faster a tire can be driven
> > without
> > > > hydroplaning. That's because the narrower the footprint, the less
tire
> > > > surface the water can push against. That's why snow skiis wouldn't
work
> > for
> > > > waterskiing unless you were going 90 mph. ;)
> > > >
> > > > A simple formula taught to pilots to determine the estimated speed
at
> > which
> > > > a tire will hydroplane is 9 times the square root of the tire
pressure
> > > > equals the estimated speed a tire will hydroplane at. So for
example if
> > a
> > > > tire were inflated to 25 psi, it would likely hydroplane somewhere
near
> > 45
> > > > mph. If that same tire were inflated higher to 36 psi, it'd likely
> > > > hydroplane at 54 mph. So the air pressure the tire is filled to is
> > directly
> > > > proportional to the estimated speed at which it will hydroplane at.
:)
> > > >
> > > > Jerry
> > > > --
> > > > Jerry Bransford
> > > > To email, remove 'me' from my email address
> > > > KC6TAY, PP-ASEL
> > > > See the Geezer Jeep at
> > > > http://members.***.net/jerrypb/
> > > >
> > > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > > news:3FD24818.B3B8B0B6@sympatico.ca...
> > > > > I drove my brother in laws Volvo once with 60 series tires on it
and
> > > > > that thing couldn't go over 50 mph in a heavy rain without losing
the
> > > > > steering control due to hydroplaning.
> > > > >
> > > > > Turns out the tires were at the sidewall max pressure, not the 32
psi
> > > > > recommended. The water had free space to get under the sides of
the
> > > > > tread lifting the tire up off the road.
> > > > >
> > > > > I do agree too low is bad too.
> > > > >
> > > > > Mike
> > > > >
> > > > > mabar wrote:
> > > > > >
> > > > > > Mike:
> > > > > >
> > > > > > I agree, 48 lbs. is WAY TOO MUCH pressure for that application,
but
> > as
> > > > far
> > > > > > as hydroplaning goes...
> > > > > >
> > > > > > A tire with lower than recommended pressure will hydroplane
easier,
> > > > quicker,
> > > > > > and at lower speeds.
> > > > > >
> > > > > > A tire with higher than recommended pressure will hydroplane
less,
> > and
> > > > > > usually at higher speeds.
> > > > > >
> > > > > > Tom
> > > > > >
> > > > > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > > > > news:3FD234FC.A668B58@sympatico.ca...
> > > > > > > That is actually pretty dangerous.....
> > > > > > >
> > > > > > > At that pressure you only have about 1/4 of your tread
actually
> > > > touching
> > > > > > > the road when you drive straight.
> > > > > > >
> > > > > > > This can lead to a fast end to end swap if you hit water or
snow.
> > > > They
> > > > > > > will hydroplane fast and quick and you will be doing 360's
quicker
> > > > than
> > > > > > > you can blink.
> > > > > > >
> > > > > > > The water will get under the other 3/4 of the tread and
literally
> > lift
> > > > > > > you right off the road.
> > > > > > >
> > > > > > > I tested my 33x9.5's with 35 psi in them and only had 4" of
tread
> > on
> > > > the
> > > > > > > ground. I got the best grip at 28 psi.
> > > > > > >
> > > > > > > When I used 31x10.5's they wore out perfectly even all across
and
> > I
> > > > was
> > > > > > > running at 26 psi city, 28 highway.
> > > > > > >
> > > > > > > Now If I had those tires on a 1 ton truck and carried a load,
I
> > would
> > > > > > > run them close to the top rated pressure.
> > > > > > >
> > > > > > > But a Wrangler is only a 1/4 ton truck.....
> > > > > > >
> > > > > > > Mike
> > > > > > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > > > > > 88 Cherokee 235 BFG AT's
> > > > > > >
> > > > > > > > me wrote:
> > > > > > > >
> > > > > > > > Duh, I meant to say that I have my 31x10.5x15 MT/Rs at 48
lbs.
> > I
> > > > > > > > believe the sidewall says 50 psi.
> > > > > > > >
> > > > > > > > me wrote:
> > > > > > > >
> > > > > > > > > Hold on. You guys are running 31x10.5x16 MT/Rs at 27 and
30
> > lbs
> > > > on
> > > > > > > > > road?? I've got 31x10.5x15 MT/Rs on my stock '98 TJ Sport
and
> > it
> > > > > > > > > rides pretty nice. They are noisy even with the hard top
on,
> > but
> > > > > > > > > the ride isn't so bad.
> > > > > > > > >
> > > > > > > > > Nathan Otis wrote:
> > > > > > > > >
> > > > > > > > >> I run mine at 27psi.
> > > > > > > > >> n.
> > > > > > > > >>
> > > > > > > > >> "bob zee" <cam509@linuxmail.org> wrote in message
> > > > > > > > >> news:bqq0e7$24j2kk$1@ID-177997.news.uni-berlin.de...
> > > > > > > > >>
> > > > > > > > >>
> > > > > > > > >> > these tires have a some info on the sidewall about max
load
> > at
> > > > > > > > >> > 80psi.
> > > > > > > > >> > 80psi!?!?!
> > > > > > > > >> > great info if you want to run a max load, but what
about
> > all of
> > > > > > > > >> > the other
> > > > > > > > >> > time?
> > > > > > > > >> >
> > > > > > > > >> > 8~)>
> > > > > > > > >> >
> > > > > > > > >> > what would you guys run in these tires? this vehicle
gets
> > used
> > > > > > > > >> > for about
> > > > > > > > >> > 400 miles per week (200 miles of interstate and the
> > remainder
> > > > is
> > > > > > > > >> > rural
> > > > > > > > >> > highway and city).
> > > > > > > > >> >
> > > > > > > > >> > --
> > > > > > > > >> > bob z.
> > > > > > > > >> > p.s. the police aren't targetting you. *you* are
making
> > > > > > > > >> > yourself a
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >> target.
> > > > > > > > >>
> > > > > > > > >>
> > > > > > > > >> > "people with less brain power than you are doing more
diffi
> > cult
> > > > > > > > >> > things
> > > > > > > > >> > everyday"©
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >>
> > > > > > > > >>
> > > > > > > > >>
are over inflated are narrower than wide tires that are properly or under
inflated.
I think I get your point though. If the wide tires are over inflated, then
there is an opportunity for some portion of the tread to be lifted on a thin
film of water, setting up the conditions for hydroplaning perhaps even
earlier than might otherwise happen.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3FD3EF27.B7E400A7@sympatico.ca...
> The 9.5's don't have the lift off factor though. The wide tires over
> inflated can just lift up off the ground due to the open space between
> the tread and road.
>
> Mike
>
> CRWLR wrote:
> >
> > I would have thunk you knew this because you have found that your 9.50s
> > prevail where guys with 12.50s have trouble. Your 9.50s are better for
> > almost exactly the same reasons as overinflating.
> >
> > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > news:3FD25AF7.D3D1FE10@sympatico.ca...
> > > Interesting info, thanks.
> > >
> > > The tires I was thinking on were P215x60x15. They are wide and flat,
> > > and those suckers lifted off at high pressure and never let go at the
> > > lower proper psi, you could cruise at 70 with the traffic easy in the
> > > rain.
> > >
> > > You are going for the wider the footprint, the lower the psi contact
> > > patch is so light the whole tire floats.
> > >
> > > These ones just up and lost it when they hit a puddle.
> > >
> > > A narrow tire (7.5") like I have doesn't really have issues like a
10.5
> > > or 12.5 tire.
> > >
> > > Your formula is based on one sized tire I think. Tall skinny sure
> > > reacts to traction issues different than shorter or the same height,
> > > wide tire.
> > >
> > > Mike
> > >
> > > Jerry Bransford wrote:
> > > >
> > > > Mike, the higher the tire pressure, the faster a tire can be driven
> > without
> > > > hydroplaning. That's because the narrower the footprint, the less
tire
> > > > surface the water can push against. That's why snow skiis wouldn't
work
> > for
> > > > waterskiing unless you were going 90 mph. ;)
> > > >
> > > > A simple formula taught to pilots to determine the estimated speed
at
> > which
> > > > a tire will hydroplane is 9 times the square root of the tire
pressure
> > > > equals the estimated speed a tire will hydroplane at. So for
example if
> > a
> > > > tire were inflated to 25 psi, it would likely hydroplane somewhere
near
> > 45
> > > > mph. If that same tire were inflated higher to 36 psi, it'd likely
> > > > hydroplane at 54 mph. So the air pressure the tire is filled to is
> > directly
> > > > proportional to the estimated speed at which it will hydroplane at.
:)
> > > >
> > > > Jerry
> > > > --
> > > > Jerry Bransford
> > > > To email, remove 'me' from my email address
> > > > KC6TAY, PP-ASEL
> > > > See the Geezer Jeep at
> > > > http://members.***.net/jerrypb/
> > > >
> > > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > > news:3FD24818.B3B8B0B6@sympatico.ca...
> > > > > I drove my brother in laws Volvo once with 60 series tires on it
and
> > > > > that thing couldn't go over 50 mph in a heavy rain without losing
the
> > > > > steering control due to hydroplaning.
> > > > >
> > > > > Turns out the tires were at the sidewall max pressure, not the 32
psi
> > > > > recommended. The water had free space to get under the sides of
the
> > > > > tread lifting the tire up off the road.
> > > > >
> > > > > I do agree too low is bad too.
> > > > >
> > > > > Mike
> > > > >
> > > > > mabar wrote:
> > > > > >
> > > > > > Mike:
> > > > > >
> > > > > > I agree, 48 lbs. is WAY TOO MUCH pressure for that application,
but
> > as
> > > > far
> > > > > > as hydroplaning goes...
> > > > > >
> > > > > > A tire with lower than recommended pressure will hydroplane
easier,
> > > > quicker,
> > > > > > and at lower speeds.
> > > > > >
> > > > > > A tire with higher than recommended pressure will hydroplane
less,
> > and
> > > > > > usually at higher speeds.
> > > > > >
> > > > > > Tom
> > > > > >
> > > > > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > > > > news:3FD234FC.A668B58@sympatico.ca...
> > > > > > > That is actually pretty dangerous.....
> > > > > > >
> > > > > > > At that pressure you only have about 1/4 of your tread
actually
> > > > touching
> > > > > > > the road when you drive straight.
> > > > > > >
> > > > > > > This can lead to a fast end to end swap if you hit water or
snow.
> > > > They
> > > > > > > will hydroplane fast and quick and you will be doing 360's
quicker
> > > > than
> > > > > > > you can blink.
> > > > > > >
> > > > > > > The water will get under the other 3/4 of the tread and
literally
> > lift
> > > > > > > you right off the road.
> > > > > > >
> > > > > > > I tested my 33x9.5's with 35 psi in them and only had 4" of
tread
> > on
> > > > the
> > > > > > > ground. I got the best grip at 28 psi.
> > > > > > >
> > > > > > > When I used 31x10.5's they wore out perfectly even all across
and
> > I
> > > > was
> > > > > > > running at 26 psi city, 28 highway.
> > > > > > >
> > > > > > > Now If I had those tires on a 1 ton truck and carried a load,
I
> > would
> > > > > > > run them close to the top rated pressure.
> > > > > > >
> > > > > > > But a Wrangler is only a 1/4 ton truck.....
> > > > > > >
> > > > > > > Mike
> > > > > > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > > > > > 88 Cherokee 235 BFG AT's
> > > > > > >
> > > > > > > > me wrote:
> > > > > > > >
> > > > > > > > Duh, I meant to say that I have my 31x10.5x15 MT/Rs at 48
lbs.
> > I
> > > > > > > > believe the sidewall says 50 psi.
> > > > > > > >
> > > > > > > > me wrote:
> > > > > > > >
> > > > > > > > > Hold on. You guys are running 31x10.5x16 MT/Rs at 27 and
30
> > lbs
> > > > on
> > > > > > > > > road?? I've got 31x10.5x15 MT/Rs on my stock '98 TJ Sport
and
> > it
> > > > > > > > > rides pretty nice. They are noisy even with the hard top
on,
> > but
> > > > > > > > > the ride isn't so bad.
> > > > > > > > >
> > > > > > > > > Nathan Otis wrote:
> > > > > > > > >
> > > > > > > > >> I run mine at 27psi.
> > > > > > > > >> n.
> > > > > > > > >>
> > > > > > > > >> "bob zee" <cam509@linuxmail.org> wrote in message
> > > > > > > > >> news:bqq0e7$24j2kk$1@ID-177997.news.uni-berlin.de...
> > > > > > > > >>
> > > > > > > > >>
> > > > > > > > >> > these tires have a some info on the sidewall about max
load
> > at
> > > > > > > > >> > 80psi.
> > > > > > > > >> > 80psi!?!?!
> > > > > > > > >> > great info if you want to run a max load, but what
about
> > all of
> > > > > > > > >> > the other
> > > > > > > > >> > time?
> > > > > > > > >> >
> > > > > > > > >> > 8~)>
> > > > > > > > >> >
> > > > > > > > >> > what would you guys run in these tires? this vehicle
gets
> > used
> > > > > > > > >> > for about
> > > > > > > > >> > 400 miles per week (200 miles of interstate and the
> > remainder
> > > > is
> > > > > > > > >> > rural
> > > > > > > > >> > highway and city).
> > > > > > > > >> >
> > > > > > > > >> > --
> > > > > > > > >> > bob z.
> > > > > > > > >> > p.s. the police aren't targetting you. *you* are
making
> > > > > > > > >> > yourself a
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >> target.
> > > > > > > > >>
> > > > > > > > >>
> > > > > > > > >> > "people with less brain power than you are doing more
diffi
> > cult
> > > > > > > > >> > things
> > > > > > > > >> > everyday"©
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >>
> > > > > > > > >>
> > > > > > > > >>
#90
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires-DUH!
Thin tires will not hydroplane as easily as wide tires, and wide tires that
are over inflated are narrower than wide tires that are properly or under
inflated.
I think I get your point though. If the wide tires are over inflated, then
there is an opportunity for some portion of the tread to be lifted on a thin
film of water, setting up the conditions for hydroplaning perhaps even
earlier than might otherwise happen.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3FD3EF27.B7E400A7@sympatico.ca...
> The 9.5's don't have the lift off factor though. The wide tires over
> inflated can just lift up off the ground due to the open space between
> the tread and road.
>
> Mike
>
> CRWLR wrote:
> >
> > I would have thunk you knew this because you have found that your 9.50s
> > prevail where guys with 12.50s have trouble. Your 9.50s are better for
> > almost exactly the same reasons as overinflating.
> >
> > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > news:3FD25AF7.D3D1FE10@sympatico.ca...
> > > Interesting info, thanks.
> > >
> > > The tires I was thinking on were P215x60x15. They are wide and flat,
> > > and those suckers lifted off at high pressure and never let go at the
> > > lower proper psi, you could cruise at 70 with the traffic easy in the
> > > rain.
> > >
> > > You are going for the wider the footprint, the lower the psi contact
> > > patch is so light the whole tire floats.
> > >
> > > These ones just up and lost it when they hit a puddle.
> > >
> > > A narrow tire (7.5") like I have doesn't really have issues like a
10.5
> > > or 12.5 tire.
> > >
> > > Your formula is based on one sized tire I think. Tall skinny sure
> > > reacts to traction issues different than shorter or the same height,
> > > wide tire.
> > >
> > > Mike
> > >
> > > Jerry Bransford wrote:
> > > >
> > > > Mike, the higher the tire pressure, the faster a tire can be driven
> > without
> > > > hydroplaning. That's because the narrower the footprint, the less
tire
> > > > surface the water can push against. That's why snow skiis wouldn't
work
> > for
> > > > waterskiing unless you were going 90 mph. ;)
> > > >
> > > > A simple formula taught to pilots to determine the estimated speed
at
> > which
> > > > a tire will hydroplane is 9 times the square root of the tire
pressure
> > > > equals the estimated speed a tire will hydroplane at. So for
example if
> > a
> > > > tire were inflated to 25 psi, it would likely hydroplane somewhere
near
> > 45
> > > > mph. If that same tire were inflated higher to 36 psi, it'd likely
> > > > hydroplane at 54 mph. So the air pressure the tire is filled to is
> > directly
> > > > proportional to the estimated speed at which it will hydroplane at.
:)
> > > >
> > > > Jerry
> > > > --
> > > > Jerry Bransford
> > > > To email, remove 'me' from my email address
> > > > KC6TAY, PP-ASEL
> > > > See the Geezer Jeep at
> > > > http://members.***.net/jerrypb/
> > > >
> > > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > > news:3FD24818.B3B8B0B6@sympatico.ca...
> > > > > I drove my brother in laws Volvo once with 60 series tires on it
and
> > > > > that thing couldn't go over 50 mph in a heavy rain without losing
the
> > > > > steering control due to hydroplaning.
> > > > >
> > > > > Turns out the tires were at the sidewall max pressure, not the 32
psi
> > > > > recommended. The water had free space to get under the sides of
the
> > > > > tread lifting the tire up off the road.
> > > > >
> > > > > I do agree too low is bad too.
> > > > >
> > > > > Mike
> > > > >
> > > > > mabar wrote:
> > > > > >
> > > > > > Mike:
> > > > > >
> > > > > > I agree, 48 lbs. is WAY TOO MUCH pressure for that application,
but
> > as
> > > > far
> > > > > > as hydroplaning goes...
> > > > > >
> > > > > > A tire with lower than recommended pressure will hydroplane
easier,
> > > > quicker,
> > > > > > and at lower speeds.
> > > > > >
> > > > > > A tire with higher than recommended pressure will hydroplane
less,
> > and
> > > > > > usually at higher speeds.
> > > > > >
> > > > > > Tom
> > > > > >
> > > > > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > > > > news:3FD234FC.A668B58@sympatico.ca...
> > > > > > > That is actually pretty dangerous.....
> > > > > > >
> > > > > > > At that pressure you only have about 1/4 of your tread
actually
> > > > touching
> > > > > > > the road when you drive straight.
> > > > > > >
> > > > > > > This can lead to a fast end to end swap if you hit water or
snow.
> > > > They
> > > > > > > will hydroplane fast and quick and you will be doing 360's
quicker
> > > > than
> > > > > > > you can blink.
> > > > > > >
> > > > > > > The water will get under the other 3/4 of the tread and
literally
> > lift
> > > > > > > you right off the road.
> > > > > > >
> > > > > > > I tested my 33x9.5's with 35 psi in them and only had 4" of
tread
> > on
> > > > the
> > > > > > > ground. I got the best grip at 28 psi.
> > > > > > >
> > > > > > > When I used 31x10.5's they wore out perfectly even all across
and
> > I
> > > > was
> > > > > > > running at 26 psi city, 28 highway.
> > > > > > >
> > > > > > > Now If I had those tires on a 1 ton truck and carried a load,
I
> > would
> > > > > > > run them close to the top rated pressure.
> > > > > > >
> > > > > > > But a Wrangler is only a 1/4 ton truck.....
> > > > > > >
> > > > > > > Mike
> > > > > > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > > > > > 88 Cherokee 235 BFG AT's
> > > > > > >
> > > > > > > > me wrote:
> > > > > > > >
> > > > > > > > Duh, I meant to say that I have my 31x10.5x15 MT/Rs at 48
lbs.
> > I
> > > > > > > > believe the sidewall says 50 psi.
> > > > > > > >
> > > > > > > > me wrote:
> > > > > > > >
> > > > > > > > > Hold on. You guys are running 31x10.5x16 MT/Rs at 27 and
30
> > lbs
> > > > on
> > > > > > > > > road?? I've got 31x10.5x15 MT/Rs on my stock '98 TJ Sport
and
> > it
> > > > > > > > > rides pretty nice. They are noisy even with the hard top
on,
> > but
> > > > > > > > > the ride isn't so bad.
> > > > > > > > >
> > > > > > > > > Nathan Otis wrote:
> > > > > > > > >
> > > > > > > > >> I run mine at 27psi.
> > > > > > > > >> n.
> > > > > > > > >>
> > > > > > > > >> "bob zee" <cam509@linuxmail.org> wrote in message
> > > > > > > > >> news:bqq0e7$24j2kk$1@ID-177997.news.uni-berlin.de...
> > > > > > > > >>
> > > > > > > > >>
> > > > > > > > >> > these tires have a some info on the sidewall about max
load
> > at
> > > > > > > > >> > 80psi.
> > > > > > > > >> > 80psi!?!?!
> > > > > > > > >> > great info if you want to run a max load, but what
about
> > all of
> > > > > > > > >> > the other
> > > > > > > > >> > time?
> > > > > > > > >> >
> > > > > > > > >> > 8~)>
> > > > > > > > >> >
> > > > > > > > >> > what would you guys run in these tires? this vehicle
gets
> > used
> > > > > > > > >> > for about
> > > > > > > > >> > 400 miles per week (200 miles of interstate and the
> > remainder
> > > > is
> > > > > > > > >> > rural
> > > > > > > > >> > highway and city).
> > > > > > > > >> >
> > > > > > > > >> > --
> > > > > > > > >> > bob z.
> > > > > > > > >> > p.s. the police aren't targetting you. *you* are
making
> > > > > > > > >> > yourself a
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >> target.
> > > > > > > > >>
> > > > > > > > >>
> > > > > > > > >> > "people with less brain power than you are doing more
diffi
> > cult
> > > > > > > > >> > things
> > > > > > > > >> > everyday"©
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >>
> > > > > > > > >>
> > > > > > > > >>
are over inflated are narrower than wide tires that are properly or under
inflated.
I think I get your point though. If the wide tires are over inflated, then
there is an opportunity for some portion of the tread to be lifted on a thin
film of water, setting up the conditions for hydroplaning perhaps even
earlier than might otherwise happen.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3FD3EF27.B7E400A7@sympatico.ca...
> The 9.5's don't have the lift off factor though. The wide tires over
> inflated can just lift up off the ground due to the open space between
> the tread and road.
>
> Mike
>
> CRWLR wrote:
> >
> > I would have thunk you knew this because you have found that your 9.50s
> > prevail where guys with 12.50s have trouble. Your 9.50s are better for
> > almost exactly the same reasons as overinflating.
> >
> > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > news:3FD25AF7.D3D1FE10@sympatico.ca...
> > > Interesting info, thanks.
> > >
> > > The tires I was thinking on were P215x60x15. They are wide and flat,
> > > and those suckers lifted off at high pressure and never let go at the
> > > lower proper psi, you could cruise at 70 with the traffic easy in the
> > > rain.
> > >
> > > You are going for the wider the footprint, the lower the psi contact
> > > patch is so light the whole tire floats.
> > >
> > > These ones just up and lost it when they hit a puddle.
> > >
> > > A narrow tire (7.5") like I have doesn't really have issues like a
10.5
> > > or 12.5 tire.
> > >
> > > Your formula is based on one sized tire I think. Tall skinny sure
> > > reacts to traction issues different than shorter or the same height,
> > > wide tire.
> > >
> > > Mike
> > >
> > > Jerry Bransford wrote:
> > > >
> > > > Mike, the higher the tire pressure, the faster a tire can be driven
> > without
> > > > hydroplaning. That's because the narrower the footprint, the less
tire
> > > > surface the water can push against. That's why snow skiis wouldn't
work
> > for
> > > > waterskiing unless you were going 90 mph. ;)
> > > >
> > > > A simple formula taught to pilots to determine the estimated speed
at
> > which
> > > > a tire will hydroplane is 9 times the square root of the tire
pressure
> > > > equals the estimated speed a tire will hydroplane at. So for
example if
> > a
> > > > tire were inflated to 25 psi, it would likely hydroplane somewhere
near
> > 45
> > > > mph. If that same tire were inflated higher to 36 psi, it'd likely
> > > > hydroplane at 54 mph. So the air pressure the tire is filled to is
> > directly
> > > > proportional to the estimated speed at which it will hydroplane at.
:)
> > > >
> > > > Jerry
> > > > --
> > > > Jerry Bransford
> > > > To email, remove 'me' from my email address
> > > > KC6TAY, PP-ASEL
> > > > See the Geezer Jeep at
> > > > http://members.***.net/jerrypb/
> > > >
> > > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > > news:3FD24818.B3B8B0B6@sympatico.ca...
> > > > > I drove my brother in laws Volvo once with 60 series tires on it
and
> > > > > that thing couldn't go over 50 mph in a heavy rain without losing
the
> > > > > steering control due to hydroplaning.
> > > > >
> > > > > Turns out the tires were at the sidewall max pressure, not the 32
psi
> > > > > recommended. The water had free space to get under the sides of
the
> > > > > tread lifting the tire up off the road.
> > > > >
> > > > > I do agree too low is bad too.
> > > > >
> > > > > Mike
> > > > >
> > > > > mabar wrote:
> > > > > >
> > > > > > Mike:
> > > > > >
> > > > > > I agree, 48 lbs. is WAY TOO MUCH pressure for that application,
but
> > as
> > > > far
> > > > > > as hydroplaning goes...
> > > > > >
> > > > > > A tire with lower than recommended pressure will hydroplane
easier,
> > > > quicker,
> > > > > > and at lower speeds.
> > > > > >
> > > > > > A tire with higher than recommended pressure will hydroplane
less,
> > and
> > > > > > usually at higher speeds.
> > > > > >
> > > > > > Tom
> > > > > >
> > > > > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > > > > news:3FD234FC.A668B58@sympatico.ca...
> > > > > > > That is actually pretty dangerous.....
> > > > > > >
> > > > > > > At that pressure you only have about 1/4 of your tread
actually
> > > > touching
> > > > > > > the road when you drive straight.
> > > > > > >
> > > > > > > This can lead to a fast end to end swap if you hit water or
snow.
> > > > They
> > > > > > > will hydroplane fast and quick and you will be doing 360's
quicker
> > > > than
> > > > > > > you can blink.
> > > > > > >
> > > > > > > The water will get under the other 3/4 of the tread and
literally
> > lift
> > > > > > > you right off the road.
> > > > > > >
> > > > > > > I tested my 33x9.5's with 35 psi in them and only had 4" of
tread
> > on
> > > > the
> > > > > > > ground. I got the best grip at 28 psi.
> > > > > > >
> > > > > > > When I used 31x10.5's they wore out perfectly even all across
and
> > I
> > > > was
> > > > > > > running at 26 psi city, 28 highway.
> > > > > > >
> > > > > > > Now If I had those tires on a 1 ton truck and carried a load,
I
> > would
> > > > > > > run them close to the top rated pressure.
> > > > > > >
> > > > > > > But a Wrangler is only a 1/4 ton truck.....
> > > > > > >
> > > > > > > Mike
> > > > > > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > > > > > 88 Cherokee 235 BFG AT's
> > > > > > >
> > > > > > > > me wrote:
> > > > > > > >
> > > > > > > > Duh, I meant to say that I have my 31x10.5x15 MT/Rs at 48
lbs.
> > I
> > > > > > > > believe the sidewall says 50 psi.
> > > > > > > >
> > > > > > > > me wrote:
> > > > > > > >
> > > > > > > > > Hold on. You guys are running 31x10.5x16 MT/Rs at 27 and
30
> > lbs
> > > > on
> > > > > > > > > road?? I've got 31x10.5x15 MT/Rs on my stock '98 TJ Sport
and
> > it
> > > > > > > > > rides pretty nice. They are noisy even with the hard top
on,
> > but
> > > > > > > > > the ride isn't so bad.
> > > > > > > > >
> > > > > > > > > Nathan Otis wrote:
> > > > > > > > >
> > > > > > > > >> I run mine at 27psi.
> > > > > > > > >> n.
> > > > > > > > >>
> > > > > > > > >> "bob zee" <cam509@linuxmail.org> wrote in message
> > > > > > > > >> news:bqq0e7$24j2kk$1@ID-177997.news.uni-berlin.de...
> > > > > > > > >>
> > > > > > > > >>
> > > > > > > > >> > these tires have a some info on the sidewall about max
load
> > at
> > > > > > > > >> > 80psi.
> > > > > > > > >> > 80psi!?!?!
> > > > > > > > >> > great info if you want to run a max load, but what
about
> > all of
> > > > > > > > >> > the other
> > > > > > > > >> > time?
> > > > > > > > >> >
> > > > > > > > >> > 8~)>
> > > > > > > > >> >
> > > > > > > > >> > what would you guys run in these tires? this vehicle
gets
> > used
> > > > > > > > >> > for about
> > > > > > > > >> > 400 miles per week (200 miles of interstate and the
> > remainder
> > > > is
> > > > > > > > >> > rural
> > > > > > > > >> > highway and city).
> > > > > > > > >> >
> > > > > > > > >> > --
> > > > > > > > >> > bob z.
> > > > > > > > >> > p.s. the police aren't targetting you. *you* are
making
> > > > > > > > >> > yourself a
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >> target.
> > > > > > > > >>
> > > > > > > > >>
> > > > > > > > >> > "people with less brain power than you are doing more
diffi
> > cult
> > > > > > > > >> > things
> > > > > > > > >> > everyday"©
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >>
> > > > > > > > >>
> > > > > > > > >>