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Old 05-22-2009, 10:46 AM   #1
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Proper Tire PSI

Does anyone know the proper tire PSI on 33"x12.5"x15" Mickey Thompson tires? They seem to be more worn in the center.

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Old 05-22-2009, 10:52 AM   #2
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The best method is to use the chalk trick. Rub a trip across your tire and drive around the block a couple times. If the center is worn, lower your tire psi. If the sides are worn raise it, and if its completely gone your good.

I believe the proper pressure for 33's is around 25 depending on your jeeps weight and such.

Judging by you saying the center of your tires are worn, I would suggest lowering it. I run my 35's at 22 psi.

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Old 05-22-2009, 12:03 PM   #3
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I run my 33's at 28 - 30 psi for street.
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Old 05-22-2009, 12:09 PM   #4
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For 33x12.50 tires, 28 psi is pretty optimal on the street when supporting a vehicle with the weight of a Wrangler. I run my 35x12.50 tires at 26 and get perfectly even wear.
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Old 05-22-2009, 01:52 PM   #5
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Originally Posted by Sb5551 View Post
Judging by you saying the center of your tires are worn, I would suggest lowering it. I run my 35's at 22 psi.
x2 if the center is worn prematurely the pressure is too hi.

too many people see the side of the tire say max 44 psi, or whatever, and do that. wrong. tires fit many vehicles, you gotta go by what your application calls for.
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Old 05-22-2009, 07:41 PM   #6
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Originally Posted by jerry bransford View Post
for 33x12.50 tires, 28 psi is pretty optimal on the street when supporting a vehicle with the weight of a wrangler. I run my 35x12.50 tires at 26 and get perfectly even wear.
x2
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Old 05-22-2009, 10:31 PM   #7
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Isn't there also a way by calculating? Meaning you take the max load per tire and divideded by the weight of the vehicle? I know I figured this out before but not sure..Heeeeelp
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Old 05-23-2009, 12:49 PM   #8
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It's amazing the difference in the ride once I got the PSI down to about 28. I no longer bounce like a basketball on the highway when I hit a bump. They had it up to 40+ PSI.
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Old 05-23-2009, 04:27 PM   #9
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40psi!!! who's they?
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Old 05-23-2009, 06:42 PM   #10
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When I was running 33's I went around with about 20 to 25 psi in mine.
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Old 05-24-2009, 06:24 PM   #11
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30 psi in the rear and 32 in the front for 33x10.5 seems to drive well and show even tread wear.

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