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^^You should never have to run max. Assuming you have aftermarket tires...For 33's you should run about 30-32 PSI. For 35's, 28-30. If your tires are stock, go by your door placard.

If you really wanna dial it in, do a chalk test. See post #54 in the link below.

Highway speed drifting

And here's a visual representation of how the chalk test works...without the chalk. :D

View attachment 87520
 

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it depends on the tire, and the weight of your vehical. the 33x12.50x15s run best between 28 to 26 psi on a TJ.
 

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I've got a related question, I have Coursers on my Sahara but one has a hole that can't be patched... long story short, to keep from buying a mismatched tire since the AWT is not available I put my Goodyear Wrangler spare one and plan to buy a used cheapo for a spare. Question is: the Coursers have max PSI of 50, the Goodyear has max of 32 psi. Is that going to be dangerous or ride bad. Don't want to kill myself cheaping over a 150.00 tire. but the next full set i get will be more aggressive tread, so i hate to throw money down the drain because the other three are 60% tread
 

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it depends on the tire, and the weight of your vehical. the 33x12.50x15s run best between 28 to 26 psi on a TJ.
I see I forgot something, I meant to say the GoodYear Duratrac 33x12.50x15 tires run best between 28 to 26 psi on a TJ.
 

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I have had the duratrac for about 8k now and have run 34 psi without any problems nice humm and great even treadware...
 

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I started out with the higher pressure, but the steering felt like I was riding on over inflated beach balls. I dropped it bit by bit and settled at 26 psi with a good contact patch and smooth ride.
 

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Every jeep/tire combo is different, you can do the chalk test or experiment. When I went to 35s on my Rubi I tried 18 to 28 psi.
I like 20 for the ride and wear. I've went up to 24-26 to see if fuel mileage picked up, couldn't tell much if any difference, gets around 15 on the highway. I use 8 psi on the trail and redrocks.
Ron
 

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Every jeep/tire combo is different, you can do the chalk test or experiment. When I went to 35s on my Rubi I tried 18 to 28 psi.
I like 20 for the ride and wear. I've went up to 24-26 to see if fuel mileage picked up, couldn't tell much if any difference, gets around 15 on the highway. I use 8 psi on the trail and redrocks.
Ron
:eek:

20?

Please, take JYJeep's advice.
 

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While were on the topic what about 31" Goodyear all terrains? I have them at 28psi right now but should I be higher?
 
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