Rubicon - Wrangler Tires
#91
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"©
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >> >
> > > > > > > > >>
> > > > > > > > >>
> > > > > > > > >>
#92
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires-DUH!
Yes, I have had it happen on 'performance' 60 series tires on a Volvo
GLT that would just fly with proper pressure in the tires, 200 kph+.
The wider the tire, the more the middle bulges out with over pressure,
the more the side tread edges are exposed to a water or snow film lift.
Mike
CRWLR wrote:
>
> 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"©
> > > > > > > > > >> >
> > > > > > > > > >> >
> > > > > > > > > >> >
> > > > > > > > > >> >
> > > > > > > > > >>
> > > > > > > > > >>
> > > > > > > > > >>
GLT that would just fly with proper pressure in the tires, 200 kph+.
The wider the tire, the more the middle bulges out with over pressure,
the more the side tread edges are exposed to a water or snow film lift.
Mike
CRWLR wrote:
>
> 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"©
> > > > > > > > > >> >
> > > > > > > > > >> >
> > > > > > > > > >> >
> > > > > > > > > >> >
> > > > > > > > > >>
> > > > > > > > > >>
> > > > > > > > > >>
#93
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires-DUH!
Yes, I have had it happen on 'performance' 60 series tires on a Volvo
GLT that would just fly with proper pressure in the tires, 200 kph+.
The wider the tire, the more the middle bulges out with over pressure,
the more the side tread edges are exposed to a water or snow film lift.
Mike
CRWLR wrote:
>
> 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"©
> > > > > > > > > >> >
> > > > > > > > > >> >
> > > > > > > > > >> >
> > > > > > > > > >> >
> > > > > > > > > >>
> > > > > > > > > >>
> > > > > > > > > >>
GLT that would just fly with proper pressure in the tires, 200 kph+.
The wider the tire, the more the middle bulges out with over pressure,
the more the side tread edges are exposed to a water or snow film lift.
Mike
CRWLR wrote:
>
> 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"©
> > > > > > > > > >> >
> > > > > > > > > >> >
> > > > > > > > > >> >
> > > > > > > > > >> >
> > > > > > > > > >>
> > > > > > > > > >>
> > > > > > > > > >>
#94
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires-DUH!
Yes, I have had it happen on 'performance' 60 series tires on a Volvo
GLT that would just fly with proper pressure in the tires, 200 kph+.
The wider the tire, the more the middle bulges out with over pressure,
the more the side tread edges are exposed to a water or snow film lift.
Mike
CRWLR wrote:
>
> 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"©
> > > > > > > > > >> >
> > > > > > > > > >> >
> > > > > > > > > >> >
> > > > > > > > > >> >
> > > > > > > > > >>
> > > > > > > > > >>
> > > > > > > > > >>
GLT that would just fly with proper pressure in the tires, 200 kph+.
The wider the tire, the more the middle bulges out with over pressure,
the more the side tread edges are exposed to a water or snow film lift.
Mike
CRWLR wrote:
>
> 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"©
> > > > > > > > > >> >
> > > > > > > > > >> >
> > > > > > > > > >> >
> > > > > > > > > >> >
> > > > > > > > > >>
> > > > > > > > > >>
> > > > > > > > > >>
#95
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires
Roughly 12/7/03 18:59, CRWLR's monkeys randomly typed:
> I beg to differ. One should ALWAYS use the sticker on the door jamb at least
> for a starting point, then adkust the pressure as needed to balance the
> treadwear to the desired pattern. The sticker on the door jamb will provide
> an accurate tire pressure no matter what tires are on the car, as long as
> they are the right size.
... except of course for higher load range tires that need higher
pressure due to stiffer sidewalls, particularly when noted by the
tire manufacturer--presumed to be somewhat knowledgeable on their
own tires in most instances.
--
Still a Raiders fan, but no longer sure why.
> I beg to differ. One should ALWAYS use the sticker on the door jamb at least
> for a starting point, then adkust the pressure as needed to balance the
> treadwear to the desired pattern. The sticker on the door jamb will provide
> an accurate tire pressure no matter what tires are on the car, as long as
> they are the right size.
... except of course for higher load range tires that need higher
pressure due to stiffer sidewalls, particularly when noted by the
tire manufacturer--presumed to be somewhat knowledgeable on their
own tires in most instances.
--
Still a Raiders fan, but no longer sure why.
#96
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires
Roughly 12/7/03 18:59, CRWLR's monkeys randomly typed:
> I beg to differ. One should ALWAYS use the sticker on the door jamb at least
> for a starting point, then adkust the pressure as needed to balance the
> treadwear to the desired pattern. The sticker on the door jamb will provide
> an accurate tire pressure no matter what tires are on the car, as long as
> they are the right size.
... except of course for higher load range tires that need higher
pressure due to stiffer sidewalls, particularly when noted by the
tire manufacturer--presumed to be somewhat knowledgeable on their
own tires in most instances.
--
Still a Raiders fan, but no longer sure why.
> I beg to differ. One should ALWAYS use the sticker on the door jamb at least
> for a starting point, then adkust the pressure as needed to balance the
> treadwear to the desired pattern. The sticker on the door jamb will provide
> an accurate tire pressure no matter what tires are on the car, as long as
> they are the right size.
... except of course for higher load range tires that need higher
pressure due to stiffer sidewalls, particularly when noted by the
tire manufacturer--presumed to be somewhat knowledgeable on their
own tires in most instances.
--
Still a Raiders fan, but no longer sure why.
#97
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires
Roughly 12/7/03 18:59, CRWLR's monkeys randomly typed:
> I beg to differ. One should ALWAYS use the sticker on the door jamb at least
> for a starting point, then adkust the pressure as needed to balance the
> treadwear to the desired pattern. The sticker on the door jamb will provide
> an accurate tire pressure no matter what tires are on the car, as long as
> they are the right size.
... except of course for higher load range tires that need higher
pressure due to stiffer sidewalls, particularly when noted by the
tire manufacturer--presumed to be somewhat knowledgeable on their
own tires in most instances.
--
Still a Raiders fan, but no longer sure why.
> I beg to differ. One should ALWAYS use the sticker on the door jamb at least
> for a starting point, then adkust the pressure as needed to balance the
> treadwear to the desired pattern. The sticker on the door jamb will provide
> an accurate tire pressure no matter what tires are on the car, as long as
> they are the right size.
... except of course for higher load range tires that need higher
pressure due to stiffer sidewalls, particularly when noted by the
tire manufacturer--presumed to be somewhat knowledgeable on their
own tires in most instances.
--
Still a Raiders fan, but no longer sure why.
#98
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires-DUH!
Roughly 12/7/03 22:51, Mike Romain's monkeys randomly typed:
> Yes, I have had it happen on 'performance' 60 series tires on a Volvo
> GLT that would just fly with proper pressure in the tires, 200 kph+.
>
> The wider the tire, the more the middle bulges out with over pressure,
> the more the side tread edges are exposed to a water or snow film lift.
Tire construction has a lot to do with this. e.g. a steel belted
radial with several tread plies that also has the tread belts
wrapped with another belt won't do this much. On the other end
of the scale, a wide bias ply tire with only a couple tread belts
and no wrapping will bulge like a donut. Tread design and compound
has even more to do with tendency to plane under normal or overinflate
conditions.
A couple good/bad examples would be the old Firestone Wide Oval
that even managed to hydroplane in the Utah Desert...pretty
much the poster child for a hydroplaning tire at the slightest
bit of moisture. Replacing these with a set of even wider, but
good tread design, steel belted Dunlop Sport D series cured the
planing.
--
Still a Raiders fan, but no longer sure why.
> Yes, I have had it happen on 'performance' 60 series tires on a Volvo
> GLT that would just fly with proper pressure in the tires, 200 kph+.
>
> The wider the tire, the more the middle bulges out with over pressure,
> the more the side tread edges are exposed to a water or snow film lift.
Tire construction has a lot to do with this. e.g. a steel belted
radial with several tread plies that also has the tread belts
wrapped with another belt won't do this much. On the other end
of the scale, a wide bias ply tire with only a couple tread belts
and no wrapping will bulge like a donut. Tread design and compound
has even more to do with tendency to plane under normal or overinflate
conditions.
A couple good/bad examples would be the old Firestone Wide Oval
that even managed to hydroplane in the Utah Desert...pretty
much the poster child for a hydroplaning tire at the slightest
bit of moisture. Replacing these with a set of even wider, but
good tread design, steel belted Dunlop Sport D series cured the
planing.
--
Still a Raiders fan, but no longer sure why.
#99
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires-DUH!
Roughly 12/7/03 22:51, Mike Romain's monkeys randomly typed:
> Yes, I have had it happen on 'performance' 60 series tires on a Volvo
> GLT that would just fly with proper pressure in the tires, 200 kph+.
>
> The wider the tire, the more the middle bulges out with over pressure,
> the more the side tread edges are exposed to a water or snow film lift.
Tire construction has a lot to do with this. e.g. a steel belted
radial with several tread plies that also has the tread belts
wrapped with another belt won't do this much. On the other end
of the scale, a wide bias ply tire with only a couple tread belts
and no wrapping will bulge like a donut. Tread design and compound
has even more to do with tendency to plane under normal or overinflate
conditions.
A couple good/bad examples would be the old Firestone Wide Oval
that even managed to hydroplane in the Utah Desert...pretty
much the poster child for a hydroplaning tire at the slightest
bit of moisture. Replacing these with a set of even wider, but
good tread design, steel belted Dunlop Sport D series cured the
planing.
--
Still a Raiders fan, but no longer sure why.
> Yes, I have had it happen on 'performance' 60 series tires on a Volvo
> GLT that would just fly with proper pressure in the tires, 200 kph+.
>
> The wider the tire, the more the middle bulges out with over pressure,
> the more the side tread edges are exposed to a water or snow film lift.
Tire construction has a lot to do with this. e.g. a steel belted
radial with several tread plies that also has the tread belts
wrapped with another belt won't do this much. On the other end
of the scale, a wide bias ply tire with only a couple tread belts
and no wrapping will bulge like a donut. Tread design and compound
has even more to do with tendency to plane under normal or overinflate
conditions.
A couple good/bad examples would be the old Firestone Wide Oval
that even managed to hydroplane in the Utah Desert...pretty
much the poster child for a hydroplaning tire at the slightest
bit of moisture. Replacing these with a set of even wider, but
good tread design, steel belted Dunlop Sport D series cured the
planing.
--
Still a Raiders fan, but no longer sure why.
#100
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires-DUH!
Roughly 12/7/03 22:51, Mike Romain's monkeys randomly typed:
> Yes, I have had it happen on 'performance' 60 series tires on a Volvo
> GLT that would just fly with proper pressure in the tires, 200 kph+.
>
> The wider the tire, the more the middle bulges out with over pressure,
> the more the side tread edges are exposed to a water or snow film lift.
Tire construction has a lot to do with this. e.g. a steel belted
radial with several tread plies that also has the tread belts
wrapped with another belt won't do this much. On the other end
of the scale, a wide bias ply tire with only a couple tread belts
and no wrapping will bulge like a donut. Tread design and compound
has even more to do with tendency to plane under normal or overinflate
conditions.
A couple good/bad examples would be the old Firestone Wide Oval
that even managed to hydroplane in the Utah Desert...pretty
much the poster child for a hydroplaning tire at the slightest
bit of moisture. Replacing these with a set of even wider, but
good tread design, steel belted Dunlop Sport D series cured the
planing.
--
Still a Raiders fan, but no longer sure why.
> Yes, I have had it happen on 'performance' 60 series tires on a Volvo
> GLT that would just fly with proper pressure in the tires, 200 kph+.
>
> The wider the tire, the more the middle bulges out with over pressure,
> the more the side tread edges are exposed to a water or snow film lift.
Tire construction has a lot to do with this. e.g. a steel belted
radial with several tread plies that also has the tread belts
wrapped with another belt won't do this much. On the other end
of the scale, a wide bias ply tire with only a couple tread belts
and no wrapping will bulge like a donut. Tread design and compound
has even more to do with tendency to plane under normal or overinflate
conditions.
A couple good/bad examples would be the old Firestone Wide Oval
that even managed to hydroplane in the Utah Desert...pretty
much the poster child for a hydroplaning tire at the slightest
bit of moisture. Replacing these with a set of even wider, but
good tread design, steel belted Dunlop Sport D series cured the
planing.
--
Still a Raiders fan, but no longer sure why.