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Old 05-05-2011, 08:09 PM   #1
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Tire pressure for 31x10.50

I bought some aftermarket rims/tires and I'm not quite sure what tire pressure to keep the wheels at. I have a 99 TJ 4cyl with 31 x 10.50 Pro Comp Mud Terrains. So what tire pressure do you suggest, I want tire pressure for daily driving - not offroading/trail riding.

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Old 05-05-2011, 08:16 PM   #2
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I bought some aftermarket rims/tires and I'm not quite sure what tire pressure to keep the wheels at. I have a 99 TJ 4cyl with 31 x 10.50 Pro Comp Mud Terrains. So what tire pressure do you suggest, I want tire pressure for daily driving - not offroading/trail riding.
Different places will mean different tire pressures for people. To find out what is the best pressure for your jeep in your area do a chalk test.
How to Chalk Tires | eHow.com

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Old 05-05-2011, 08:17 PM   #3
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I'd venture a guess of 26-30 depending on how you like it to ride. These Wranglers don't weigh that much. Or chalk it as mentioned above.
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Old 05-05-2011, 08:18 PM   #4
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I think I ride 30 but you can go to 50 I think
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Old 05-05-2011, 08:37 PM   #5
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28-30 is a good psi for your daily driver. Do the chalk test, but start somewhere in that range.
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Old 05-06-2011, 12:58 AM   #6
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Front and rear will most likely be different PSI's, if you do the chalk test. I ran 26 and 28 in my 95 Yj with 31's and that would change when I added the hardtop in the winter.
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Old 05-06-2011, 06:01 AM   #7
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Originally Posted by Scoob View Post
Different places will mean different tire pressures for people. To find out what is the best pressure for your jeep in your area do a chalk test.
How to Chalk Tires | eHow.com
Definitely do the chalk test... Just like Scoob said in post#2. Out of curiosity though... Why put a mud terrain tire on a Jeep that stays on the pavement?
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Old 05-06-2011, 02:36 PM   #8
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Agree with the above... chalk test. I run 28 in my 31 x 10.5's(Duratracs)
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Old 05-06-2011, 02:43 PM   #9
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I think I ride 30 but you can go to 50 I think
Don't even consider 50, that is nowhere near the correct pressure for any tire supporting a vehicle with the weight of a Wrangler.

If you based that 50 psi on what you saw molded onto the tire's sidewalll, understand that pressure is never (!) the correct tire pressure to use. The tire pressure molded onto a tire's sidewall is only its maximum safe pressure to be used only if the tire is supporting its maximum safe weight. Tires on autos and Jeeps are never supporting more than about 50% of a tire's safe weight so the sidewall pressure would never be correct for that reason.

For a 31x10.50 tire, 29-31 psi at the most... 29 unloaded, 31 loaded is fine for a vehicle with the typical weight of a Wrangler.

And while the chalk test can be useful, realize that the the chalk test must be combined with experience and reasonableness. More tires are underinflated due to someone without sufficient experience to properly interpret the results. If you go strictly by the chalk test, odds are very good you'll ned up with an underinflated tire trying to get that last little bit of chalk to wear off evenly that is on the inside and outside edges of the tire.
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Old 05-06-2011, 03:28 PM   #10
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I run 28 psi in my 31" tires and have since getting them three years ago. That said, I agree the chalk test can't hurt.

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Old 05-06-2011, 03:45 PM   #11
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My 31x10.5s came from the tire shop at about 38. Rode hard as bricks. Ended up at 28 and they work well there, wear well there, ride much better there.
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Old 05-06-2011, 06:15 PM   #12
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Running 33 w/ 31bfg atko on a 6cyl auto 98. Is that ok?
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Old 05-06-2011, 06:17 PM   #13
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Running 33 w/ 31bfg atko on a 6cyl auto 98. Is that ok?
That's a little high for a 33x12.50, most like 26 to no more than 28 for that size tire when supporting a Wrangler. 31-33 is more appropriate for smaller tire sizes like 30x9.50.
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Old 05-06-2011, 06:20 PM   #14
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i ride on 31x10-5 and i have always kept them at 35 for the road and its an even tread wear. note* colder areas the pressure will lower over time, hotter places higher pressure. these tires i can run at 15-20 off road no problem
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Old 05-06-2011, 06:37 PM   #15
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15-20 psi offroad isn't even airing them down. You're really not airing them down until you get below 15 psi and with that size, you could safely go 12-13 psi offroad.

We had a guy over the weekend STRUGGLING on a trail and after a while, I asked him what pressure he was running and he said 18. I got him down to 12 psi and he became a believer after the obstacles got a lot easier for him to get up and over. The newer the Jeeper, the more afraid he is of running low enough air pressure. We had a brand-new Rubicon owner who, to use his words aired "all the way down to 20" and he was convinced that was plenty. He struggled all morning until we finally go him down to 12 also. Not airing down enough causes more problems than what people are hoping to avoid by running excessively high tire pressures when offroad.

And the higher the pressure you run offroad, the easier it is to damage a tire because the higher pressure prevents the tire from flexing around sharp objects. And 35 psi is a tad excessive for that size tire. Really.

What do I air down to with my 35x12.50 tires? If it's a tough trail, 7-8 psi which is what I consistently aired down (when necessary) to before I got my present bead locks. With my bead lock wheels, I could easily get it down lower than that without problem if the trail was that tough.
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Old 05-06-2011, 07:21 PM   #16
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Quote:
Originally Posted by Jerry Bransford
Don't even consider 50, that is nowhere near the correct pressure for any tire supporting a vehicle with the weight of a Wrangler.

If you based that 50 psi on what you saw molded onto the tire's sidewalll, understand that pressure is never (!) the correct tire pressure to use. The tire pressure molded onto a tire's sidewall is only its maximum safe pressure to be used only if the tire is supporting its maximum safe weight. Tires on autos and Jeeps are never supporting more than about 50% of a tire's safe weight so the sidewall pressure would never be correct for that reason.

For a 31x10.50 tire, 29-31 psi at the most... 29 unloaded, 31 loaded is fine for a vehicle with the typical weight of a Wrangler.

And while the chalk test can be useful, realize that the the chalk test must be combined with experience and reasonableness. More tires are underinflated due to someone without sufficient experience to properly interpret the results. If you go strictly by the chalk test, odds are very good you'll ned up with an underinflated tire trying to get that last little bit of chalk to wear off evenly that is on the inside and outside edges of the tire.
Good looks man I ride on 30 never wanted to go higher
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Old 05-07-2011, 01:13 AM   #17
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Originally Posted by Jerry Bransford
That's a little high for a 33x12.50, most like 26 to no more than 28 for that size tire when supporting a Wrangler. 31-33 is more appropriate for smaller tire sizes like 30x9.50.
Sorry I'm running 33psi on 31" tires

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