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Old 01-04-2012, 11:12 PM   #1
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tire pressure

Is it better to have the max psi in my tires or less

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Old 01-04-2012, 11:13 PM   #2
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What tire size are we dealing with? You'll most likely want to be running less than Max that's for sure!

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Old 01-04-2012, 11:58 PM   #3
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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.

Attachment 87520
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Old 01-05-2012, 08:02 PM   #4
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I have 30's
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Old 01-05-2012, 10:49 PM   #5
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I thought having lower tire pressure makes it so u have worse mpg
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Old 01-06-2012, 01:10 AM   #6
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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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Old 01-06-2012, 06:30 AM   #7
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Since you have 30s go with whatever the door frame says. 31-32psi I think
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Old 01-18-2012, 10:11 AM   #8
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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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Old 01-18-2012, 01:04 PM   #9
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which Courser tire is it?
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Old 01-18-2012, 01:07 PM   #10
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Quote:
Originally Posted by TJNewbie View Post
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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Old 01-18-2012, 01:14 PM   #11
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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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Old 01-18-2012, 05:47 PM   #12
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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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Old 01-18-2012, 09:34 PM   #13
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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.
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Old 01-18-2012, 09:50 PM   #14
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^^^ do the chalk test.
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Old 01-19-2012, 02:09 AM   #15
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Quote:
Originally Posted by Frisco Rubi View Post
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


20?

Please, take JYJeep's advice.
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Old 01-19-2012, 03:48 PM   #16
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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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