Rubicon - Wrangler Tires
12-05-2003, 12:40 PM
#11
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires
At 12/5/03 05:24, mabar bespake thusly:
> Bob:
>
> All tires have a maximum tire pressure stamped on them. That is the maximum
> tire pressure for that tire, not for your vehicle. That tire can be used on
> many vehicles, some that are MUCH heavier than a Wrangler. If you put 80 lbs
> in your Wrangler tires, the Jeep would ride like the tires were made out of
> concrete.
>
> The recommended pressure for your vehicle is on a sticker on the drivers
> door, or door jam.
Unfortunately that pressure is based on using the OEM tire, not
an aftermarket one, and simply does not apply for either a
specialty low pressure or high pressure tire. Particularly
on a high pressure tire, the factory setting may not keep
the sidewalls sufficiently straight. Plus the factory setting
is often a few pounds lower than the optimal wear setting
in an attempt to cushion the ride a bit. Only real way to
set tire pressure is to measure the contact patch.
--
Still a Raiders fan, but no longer sure why.
> Bob:
>
> All tires have a maximum tire pressure stamped on them. That is the maximum
> tire pressure for that tire, not for your vehicle. That tire can be used on
> many vehicles, some that are MUCH heavier than a Wrangler. If you put 80 lbs
> in your Wrangler tires, the Jeep would ride like the tires were made out of
> concrete.
>
> The recommended pressure for your vehicle is on a sticker on the drivers
> door, or door jam.
Unfortunately that pressure is based on using the OEM tire, not
an aftermarket one, and simply does not apply for either a
specialty low pressure or high pressure tire. Particularly
on a high pressure tire, the factory setting may not keep
the sidewalls sufficiently straight. Plus the factory setting
is often a few pounds lower than the optimal wear setting
in an attempt to cushion the ride a bit. Only real way to
set tire pressure is to measure the contact patch.
--
Still a Raiders fan, but no longer sure why.
12-05-2003, 12:40 PM
#12
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires
At 12/5/03 05:24, mabar bespake thusly:
> Bob:
>
> All tires have a maximum tire pressure stamped on them. That is the maximum
> tire pressure for that tire, not for your vehicle. That tire can be used on
> many vehicles, some that are MUCH heavier than a Wrangler. If you put 80 lbs
> in your Wrangler tires, the Jeep would ride like the tires were made out of
> concrete.
>
> The recommended pressure for your vehicle is on a sticker on the drivers
> door, or door jam.
Unfortunately that pressure is based on using the OEM tire, not
an aftermarket one, and simply does not apply for either a
specialty low pressure or high pressure tire. Particularly
on a high pressure tire, the factory setting may not keep
the sidewalls sufficiently straight. Plus the factory setting
is often a few pounds lower than the optimal wear setting
in an attempt to cushion the ride a bit. Only real way to
set tire pressure is to measure the contact patch.
--
Still a Raiders fan, but no longer sure why.
> Bob:
>
> All tires have a maximum tire pressure stamped on them. That is the maximum
> tire pressure for that tire, not for your vehicle. That tire can be used on
> many vehicles, some that are MUCH heavier than a Wrangler. If you put 80 lbs
> in your Wrangler tires, the Jeep would ride like the tires were made out of
> concrete.
>
> The recommended pressure for your vehicle is on a sticker on the drivers
> door, or door jam.
Unfortunately that pressure is based on using the OEM tire, not
an aftermarket one, and simply does not apply for either a
specialty low pressure or high pressure tire. Particularly
on a high pressure tire, the factory setting may not keep
the sidewalls sufficiently straight. Plus the factory setting
is often a few pounds lower than the optimal wear setting
in an attempt to cushion the ride a bit. Only real way to
set tire pressure is to measure the contact patch.
--
Still a Raiders fan, but no longer sure why.
12-05-2003, 12:40 PM
#13
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires
At 12/5/03 05:24, mabar bespake thusly:
> Bob:
>
> All tires have a maximum tire pressure stamped on them. That is the maximum
> tire pressure for that tire, not for your vehicle. That tire can be used on
> many vehicles, some that are MUCH heavier than a Wrangler. If you put 80 lbs
> in your Wrangler tires, the Jeep would ride like the tires were made out of
> concrete.
>
> The recommended pressure for your vehicle is on a sticker on the drivers
> door, or door jam.
Unfortunately that pressure is based on using the OEM tire, not
an aftermarket one, and simply does not apply for either a
specialty low pressure or high pressure tire. Particularly
on a high pressure tire, the factory setting may not keep
the sidewalls sufficiently straight. Plus the factory setting
is often a few pounds lower than the optimal wear setting
in an attempt to cushion the ride a bit. Only real way to
set tire pressure is to measure the contact patch.
--
Still a Raiders fan, but no longer sure why.
> Bob:
>
> All tires have a maximum tire pressure stamped on them. That is the maximum
> tire pressure for that tire, not for your vehicle. That tire can be used on
> many vehicles, some that are MUCH heavier than a Wrangler. If you put 80 lbs
> in your Wrangler tires, the Jeep would ride like the tires were made out of
> concrete.
>
> The recommended pressure for your vehicle is on a sticker on the drivers
> door, or door jam.
Unfortunately that pressure is based on using the OEM tire, not
an aftermarket one, and simply does not apply for either a
specialty low pressure or high pressure tire. Particularly
on a high pressure tire, the factory setting may not keep
the sidewalls sufficiently straight. Plus the factory setting
is often a few pounds lower than the optimal wear setting
in an attempt to cushion the ride a bit. Only real way to
set tire pressure is to measure the contact patch.
--
Still a Raiders fan, but no longer sure why.
12-05-2003, 12:44 PM
#14
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires
"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).
I run mine at 30 psi on road and 12 psi offroad. Anymore than 30 psi and it
feels like you are in fred flinstones car.
Rob
> 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"©
>
>
>
12-05-2003, 12:44 PM
#15
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires
"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).
I run mine at 30 psi on road and 12 psi offroad. Anymore than 30 psi and it
feels like you are in fred flinstones car.
Rob
> 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"©
>
>
>
12-05-2003, 12:44 PM
#16
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires
"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).
I run mine at 30 psi on road and 12 psi offroad. Anymore than 30 psi and it
feels like you are in fred flinstones car.
Rob
> 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"©
>
>
>
12-05-2003, 02:10 PM
#17
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires
I agree with this. I have a Sahara with the standard 30x9.5 Goodyear
GS-A tires still on it.
I used my 6yo daughter's sidewalk chalk. Came up with 30psi as being
"right" with perhaps a bit more necessary in the front. The sticker says
29psi, the tires say 44psi max. Use the chalk to draw a thick line
across your tires and drive STRAIGHT ahead for 50-100 feet. See if the
chalk has worn off evenly. Adjust air as necesary and repeat until you
get it right.
Or buy a $500 pyrometer and measure the tread surface temperature while
driving down the highway at 60mph until the temp is even from side to side.
My Jeep was delivered to me with the tires at 45psi. Rode like ---- and
hunted all over the highway with that much pressure. I asked the dealer
and they told me to use the pressure on the tire (!) not the sticker.
Thankfully I'm not that stupid.
You can estimate the minimum pressure 'allowable' on the road by looking
up the tire manufacturer's max load (at max PSI). You need to assume a
50/50 weight split front/rear, which for a wrangler is accurate if there
isn't a winch on the front, otherwise you need to modify this procedure
to take the higher of the front/rear loads. Both should always be the
same pressure on a 4x4 even if it isn't necesary for load reasons.
Take the max PSI, multiply that by 1/4 of your vehicle weight, and
divide by the max load for the tire. That is close to the minimum
pressure that is OK for the road. For *my* TJ Sahara that is about 26
PSI with my wife, daughter, and a tank of gas (truck stop scale!)
You can go lower on the trail because lower pressures increase the
contact patch- resulting in more square inches of tire tread supporting
the jeep at a given PSI. If you go down to 12 PSI you might increase
your contact area to twice the size which means the pressure can be half
as much and still support the Jeep. BUT, the tire flexes MUCH more and
would heat up and destroy itself if run like that at any real speed.
Lon Stowell wrote:
> Unfortunately that pressure is based on using the OEM tire, not
> an aftermarket one, and simply does not apply for either a
> specialty low pressure or high pressure tire. Particularly
> on a high pressure tire, the factory setting may not keep
> the sidewalls sufficiently straight. Plus the factory setting
> is often a few pounds lower than the optimal wear setting
> in an attempt to cushion the ride a bit. Only real way to
> set tire pressure is to measure the contact patch.
GS-A tires still on it.
I used my 6yo daughter's sidewalk chalk. Came up with 30psi as being
"right" with perhaps a bit more necessary in the front. The sticker says
29psi, the tires say 44psi max. Use the chalk to draw a thick line
across your tires and drive STRAIGHT ahead for 50-100 feet. See if the
chalk has worn off evenly. Adjust air as necesary and repeat until you
get it right.
Or buy a $500 pyrometer and measure the tread surface temperature while
driving down the highway at 60mph until the temp is even from side to side.
My Jeep was delivered to me with the tires at 45psi. Rode like ---- and
hunted all over the highway with that much pressure. I asked the dealer
and they told me to use the pressure on the tire (!) not the sticker.
Thankfully I'm not that stupid.
You can estimate the minimum pressure 'allowable' on the road by looking
up the tire manufacturer's max load (at max PSI). You need to assume a
50/50 weight split front/rear, which for a wrangler is accurate if there
isn't a winch on the front, otherwise you need to modify this procedure
to take the higher of the front/rear loads. Both should always be the
same pressure on a 4x4 even if it isn't necesary for load reasons.
Take the max PSI, multiply that by 1/4 of your vehicle weight, and
divide by the max load for the tire. That is close to the minimum
pressure that is OK for the road. For *my* TJ Sahara that is about 26
PSI with my wife, daughter, and a tank of gas (truck stop scale!)
You can go lower on the trail because lower pressures increase the
contact patch- resulting in more square inches of tire tread supporting
the jeep at a given PSI. If you go down to 12 PSI you might increase
your contact area to twice the size which means the pressure can be half
as much and still support the Jeep. BUT, the tire flexes MUCH more and
would heat up and destroy itself if run like that at any real speed.
Lon Stowell wrote:
> Unfortunately that pressure is based on using the OEM tire, not
> an aftermarket one, and simply does not apply for either a
> specialty low pressure or high pressure tire. Particularly
> on a high pressure tire, the factory setting may not keep
> the sidewalls sufficiently straight. Plus the factory setting
> is often a few pounds lower than the optimal wear setting
> in an attempt to cushion the ride a bit. Only real way to
> set tire pressure is to measure the contact patch.
12-05-2003, 02:10 PM
#18
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires
I agree with this. I have a Sahara with the standard 30x9.5 Goodyear
GS-A tires still on it.
I used my 6yo daughter's sidewalk chalk. Came up with 30psi as being
"right" with perhaps a bit more necessary in the front. The sticker says
29psi, the tires say 44psi max. Use the chalk to draw a thick line
across your tires and drive STRAIGHT ahead for 50-100 feet. See if the
chalk has worn off evenly. Adjust air as necesary and repeat until you
get it right.
Or buy a $500 pyrometer and measure the tread surface temperature while
driving down the highway at 60mph until the temp is even from side to side.
My Jeep was delivered to me with the tires at 45psi. Rode like ---- and
hunted all over the highway with that much pressure. I asked the dealer
and they told me to use the pressure on the tire (!) not the sticker.
Thankfully I'm not that stupid.
You can estimate the minimum pressure 'allowable' on the road by looking
up the tire manufacturer's max load (at max PSI). You need to assume a
50/50 weight split front/rear, which for a wrangler is accurate if there
isn't a winch on the front, otherwise you need to modify this procedure
to take the higher of the front/rear loads. Both should always be the
same pressure on a 4x4 even if it isn't necesary for load reasons.
Take the max PSI, multiply that by 1/4 of your vehicle weight, and
divide by the max load for the tire. That is close to the minimum
pressure that is OK for the road. For *my* TJ Sahara that is about 26
PSI with my wife, daughter, and a tank of gas (truck stop scale!)
You can go lower on the trail because lower pressures increase the
contact patch- resulting in more square inches of tire tread supporting
the jeep at a given PSI. If you go down to 12 PSI you might increase
your contact area to twice the size which means the pressure can be half
as much and still support the Jeep. BUT, the tire flexes MUCH more and
would heat up and destroy itself if run like that at any real speed.
Lon Stowell wrote:
> Unfortunately that pressure is based on using the OEM tire, not
> an aftermarket one, and simply does not apply for either a
> specialty low pressure or high pressure tire. Particularly
> on a high pressure tire, the factory setting may not keep
> the sidewalls sufficiently straight. Plus the factory setting
> is often a few pounds lower than the optimal wear setting
> in an attempt to cushion the ride a bit. Only real way to
> set tire pressure is to measure the contact patch.
GS-A tires still on it.
I used my 6yo daughter's sidewalk chalk. Came up with 30psi as being
"right" with perhaps a bit more necessary in the front. The sticker says
29psi, the tires say 44psi max. Use the chalk to draw a thick line
across your tires and drive STRAIGHT ahead for 50-100 feet. See if the
chalk has worn off evenly. Adjust air as necesary and repeat until you
get it right.
Or buy a $500 pyrometer and measure the tread surface temperature while
driving down the highway at 60mph until the temp is even from side to side.
My Jeep was delivered to me with the tires at 45psi. Rode like ---- and
hunted all over the highway with that much pressure. I asked the dealer
and they told me to use the pressure on the tire (!) not the sticker.
Thankfully I'm not that stupid.
You can estimate the minimum pressure 'allowable' on the road by looking
up the tire manufacturer's max load (at max PSI). You need to assume a
50/50 weight split front/rear, which for a wrangler is accurate if there
isn't a winch on the front, otherwise you need to modify this procedure
to take the higher of the front/rear loads. Both should always be the
same pressure on a 4x4 even if it isn't necesary for load reasons.
Take the max PSI, multiply that by 1/4 of your vehicle weight, and
divide by the max load for the tire. That is close to the minimum
pressure that is OK for the road. For *my* TJ Sahara that is about 26
PSI with my wife, daughter, and a tank of gas (truck stop scale!)
You can go lower on the trail because lower pressures increase the
contact patch- resulting in more square inches of tire tread supporting
the jeep at a given PSI. If you go down to 12 PSI you might increase
your contact area to twice the size which means the pressure can be half
as much and still support the Jeep. BUT, the tire flexes MUCH more and
would heat up and destroy itself if run like that at any real speed.
Lon Stowell wrote:
> Unfortunately that pressure is based on using the OEM tire, not
> an aftermarket one, and simply does not apply for either a
> specialty low pressure or high pressure tire. Particularly
> on a high pressure tire, the factory setting may not keep
> the sidewalls sufficiently straight. Plus the factory setting
> is often a few pounds lower than the optimal wear setting
> in an attempt to cushion the ride a bit. Only real way to
> set tire pressure is to measure the contact patch.
12-05-2003, 02:10 PM
#19
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires
I agree with this. I have a Sahara with the standard 30x9.5 Goodyear
GS-A tires still on it.
I used my 6yo daughter's sidewalk chalk. Came up with 30psi as being
"right" with perhaps a bit more necessary in the front. The sticker says
29psi, the tires say 44psi max. Use the chalk to draw a thick line
across your tires and drive STRAIGHT ahead for 50-100 feet. See if the
chalk has worn off evenly. Adjust air as necesary and repeat until you
get it right.
Or buy a $500 pyrometer and measure the tread surface temperature while
driving down the highway at 60mph until the temp is even from side to side.
My Jeep was delivered to me with the tires at 45psi. Rode like ---- and
hunted all over the highway with that much pressure. I asked the dealer
and they told me to use the pressure on the tire (!) not the sticker.
Thankfully I'm not that stupid.
You can estimate the minimum pressure 'allowable' on the road by looking
up the tire manufacturer's max load (at max PSI). You need to assume a
50/50 weight split front/rear, which for a wrangler is accurate if there
isn't a winch on the front, otherwise you need to modify this procedure
to take the higher of the front/rear loads. Both should always be the
same pressure on a 4x4 even if it isn't necesary for load reasons.
Take the max PSI, multiply that by 1/4 of your vehicle weight, and
divide by the max load for the tire. That is close to the minimum
pressure that is OK for the road. For *my* TJ Sahara that is about 26
PSI with my wife, daughter, and a tank of gas (truck stop scale!)
You can go lower on the trail because lower pressures increase the
contact patch- resulting in more square inches of tire tread supporting
the jeep at a given PSI. If you go down to 12 PSI you might increase
your contact area to twice the size which means the pressure can be half
as much and still support the Jeep. BUT, the tire flexes MUCH more and
would heat up and destroy itself if run like that at any real speed.
Lon Stowell wrote:
> Unfortunately that pressure is based on using the OEM tire, not
> an aftermarket one, and simply does not apply for either a
> specialty low pressure or high pressure tire. Particularly
> on a high pressure tire, the factory setting may not keep
> the sidewalls sufficiently straight. Plus the factory setting
> is often a few pounds lower than the optimal wear setting
> in an attempt to cushion the ride a bit. Only real way to
> set tire pressure is to measure the contact patch.
GS-A tires still on it.
I used my 6yo daughter's sidewalk chalk. Came up with 30psi as being
"right" with perhaps a bit more necessary in the front. The sticker says
29psi, the tires say 44psi max. Use the chalk to draw a thick line
across your tires and drive STRAIGHT ahead for 50-100 feet. See if the
chalk has worn off evenly. Adjust air as necesary and repeat until you
get it right.
Or buy a $500 pyrometer and measure the tread surface temperature while
driving down the highway at 60mph until the temp is even from side to side.
My Jeep was delivered to me with the tires at 45psi. Rode like ---- and
hunted all over the highway with that much pressure. I asked the dealer
and they told me to use the pressure on the tire (!) not the sticker.
Thankfully I'm not that stupid.
You can estimate the minimum pressure 'allowable' on the road by looking
up the tire manufacturer's max load (at max PSI). You need to assume a
50/50 weight split front/rear, which for a wrangler is accurate if there
isn't a winch on the front, otherwise you need to modify this procedure
to take the higher of the front/rear loads. Both should always be the
same pressure on a 4x4 even if it isn't necesary for load reasons.
Take the max PSI, multiply that by 1/4 of your vehicle weight, and
divide by the max load for the tire. That is close to the minimum
pressure that is OK for the road. For *my* TJ Sahara that is about 26
PSI with my wife, daughter, and a tank of gas (truck stop scale!)
You can go lower on the trail because lower pressures increase the
contact patch- resulting in more square inches of tire tread supporting
the jeep at a given PSI. If you go down to 12 PSI you might increase
your contact area to twice the size which means the pressure can be half
as much and still support the Jeep. BUT, the tire flexes MUCH more and
would heat up and destroy itself if run like that at any real speed.
Lon Stowell wrote:
> Unfortunately that pressure is based on using the OEM tire, not
> an aftermarket one, and simply does not apply for either a
> specialty low pressure or high pressure tire. Particularly
> on a high pressure tire, the factory setting may not keep
> the sidewalls sufficiently straight. Plus the factory setting
> is often a few pounds lower than the optimal wear setting
> in an attempt to cushion the ride a bit. Only real way to
> set tire pressure is to measure the contact patch.
12-05-2003, 02:17 PM
#20
Guest
Posts: n/a
Re: Rubicon - Wrangler Tires
On 05 Dec 2003 08:40 AM, Lon Stowell posted the following:
> At 12/5/03 05:24, mabar bespake thusly:
>
>> Bob:
>>
>> All tires have a maximum tire pressure stamped on them. That is the
>> maximum tire pressure for that tire, not for your vehicle. That tire
>> can be used on many vehicles, some that are MUCH heavier than a
>> Wrangler. If you put 80 lbs in your Wrangler tires, the Jeep would
>> ride like the tires were made out of concrete. The recommended
>> pressure for your vehicle is on a sticker on the drivers door, or
>> door jam.
>
> Unfortunately that pressure is based on using the OEM tire, not
> an aftermarket one, and simply does not apply for either a
> specialty low pressure or high pressure tire.
The Goodyear Wrangler MT/R _IS_ the OEM tire on the Wrangler Rubicon, so
the pressure listed on the door jamb label is correct.
In any case, the MT/R is not a "specialty high or low pressure tire."
It is certainly a specialty tire, but for running on the road you should
use the same pressure as you would any other tire of the same size and
construction on that vehicle. Off-road, you will probably want to air
down for better performance but that isn't really relevant here.
I'm running MT/Rs (aftermarket) on my TJ and I use the door jamb
pressure, but I'm running 30" tires which are a size available from the
factory. Bigger tires will most likely need to run at a slightly lower
pressure, but that doesn't make them a low pressuer tire.
----------------------------------------------------
Del Rawlins- del@_kills_spammers_rawlinsbrothers.org
Remove _kills_spammers_ to reply via email.
Unofficial Bearhawk FAQ website:
http://www.rawlinsbrothers.org/bhfaq/
> At 12/5/03 05:24, mabar bespake thusly:
>
>> Bob:
>>
>> All tires have a maximum tire pressure stamped on them. That is the
>> maximum tire pressure for that tire, not for your vehicle. That tire
>> can be used on many vehicles, some that are MUCH heavier than a
>> Wrangler. If you put 80 lbs in your Wrangler tires, the Jeep would
>> ride like the tires were made out of concrete. The recommended
>> pressure for your vehicle is on a sticker on the drivers door, or
>> door jam.
>
> Unfortunately that pressure is based on using the OEM tire, not
> an aftermarket one, and simply does not apply for either a
> specialty low pressure or high pressure tire.
The Goodyear Wrangler MT/R _IS_ the OEM tire on the Wrangler Rubicon, so
the pressure listed on the door jamb label is correct.
In any case, the MT/R is not a "specialty high or low pressure tire."
It is certainly a specialty tire, but for running on the road you should
use the same pressure as you would any other tire of the same size and
construction on that vehicle. Off-road, you will probably want to air
down for better performance but that isn't really relevant here.
I'm running MT/Rs (aftermarket) on my TJ and I use the door jamb
pressure, but I'm running 30" tires which are a size available from the
factory. Bigger tires will most likely need to run at a slightly lower
pressure, but that doesn't make them a low pressuer tire.
----------------------------------------------------
Del Rawlins- del@_kills_spammers_rawlinsbrothers.org
Remove _kills_spammers_ to reply via email.
Unofficial Bearhawk FAQ website:
http://www.rawlinsbrothers.org/bhfaq/