35's E-rated What PSI are you guys Running
04-07-2013 | 05:21 AM
#11
JK Newbie
Joined: Jan 2013
Posts: 9
Likes: 0
From: Tampa, FL
Advised by Toyo
See, everybody has a different answer and that's why I contacted Toyo. After the tech got all the info on my (2013 JK, sahara 4 door, auto tranny, 18 rims and 35" Toyo's) they came back with the answer, "we recomend 40psi cold"
04-07-2013 | 05:35 AM
#12
JK Junkie
Joined: Mar 2011
Posts: 2,145
Likes: 4
From: Israel
With around 30psi, most tires of this size feel good and have the tread sit flat - which is what makes them wear evenly.
You may try the chalk test.
Inflate to 30psi, use a chalk to mark a thick line across the tread, drive a little bit, and look at the chalk line.
If the chalk is gone at the center, the pressure is too high. Lower the pressure by 2 psi and check again. If the chalk is still gone at the center, reduce by 2 more psi and re-check.
If the chalk is gone at the sides, the pressure is too low. Increase the pressure by 2 psi and check again. Not enough? -- add 2psi and re-check.
When the chalk line wears off evenly, that's the pressure for even tire wear.
Tire pressure changes with temperature.
If you filled in cold air, then drove on a highway in hot weather for 2 hrs, there will be a few psi increase, and vice versa when the temperature drops compared to the temp' of the air which was used to inflate.
Last edited by GJeep; 04-07-2013 at 06:10 AM.
04-07-2013 | 06:48 AM
#14
JK Enthusiast
Joined: Oct 2011
Posts: 477
Likes: 1
From: Fall River,Ma.
The 'recommended' pressure is typically too high.
With around 30psi, most tires of this size feel good and have the tread sit flat - which is what makes them wear evenly.
You may try the chalk test.
Inflate to 30psi, use a chalk to mark a thick line across the tread, drive a little bit, and look at the chalk line.
If the chalk is gone at the center, the pressure is too high. Lower the pressure by 2 psi and check again. If the chalk is still gone at the center, reduce by 2 more psi and re-check.
If the chalk is gone at the sides, the pressure is too low. Increase the pressure by 2 psi and check again. Not enough? -- add 2psi and re-check.
When the chalk line wears off evenly, that's the pressure for even tire wear.
Tire pressure changes with temperature.
If you filled in cold air, then drove on a highway in hot weather for 2 hrs, there will be a few psi increase, and vice versa when the temperature drops compared to the temp' of the air which was used to inflate.
With around 30psi, most tires of this size feel good and have the tread sit flat - which is what makes them wear evenly.
You may try the chalk test.
Inflate to 30psi, use a chalk to mark a thick line across the tread, drive a little bit, and look at the chalk line.
If the chalk is gone at the center, the pressure is too high. Lower the pressure by 2 psi and check again. If the chalk is still gone at the center, reduce by 2 more psi and re-check.
If the chalk is gone at the sides, the pressure is too low. Increase the pressure by 2 psi and check again. Not enough? -- add 2psi and re-check.
When the chalk line wears off evenly, that's the pressure for even tire wear.
Tire pressure changes with temperature.
If you filled in cold air, then drove on a highway in hot weather for 2 hrs, there will be a few psi increase, and vice versa when the temperature drops compared to the temp' of the air which was used to inflate.
04-07-2013 | 08:37 AM
#15
Super Moderator
Joined: Jun 2011
Posts: 11,045
Likes: 85
From: Hendersonville, Tennessee
04-07-2013 | 05:26 PM
#20
JK Newbie
Joined: Mar 2013
Posts: 46
Likes: 0
From: Champaign,IL.
so i just got a set of 35-12.50-17 cooper STT's and i'm running them at 26 psi i havnt done the chalk test or anything but i can see that the tire isn't sitting flat, the side lugs aren't even making contact with the road , they're E rated tires and i have a 2 door rubicon, i wanna take more out of them to get the tire to sit flat , but at some point i'm thinking it will be too low for road use, does anyone else run this size on a 2 door and have any suggestions ?