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-   -   Proper Tire PSI (http://www.wranglerforum.com/f210/proper-tire-psi-30952.html)

JFT80 05-22-2009 10:46 AM

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.

Sb5551 05-22-2009 10:52 AM

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.

MouthfulOfGrass 05-22-2009 12:03 PM

I run my 33's at 28 - 30 psi for street.

Jerry Bransford 05-22-2009 12:09 PM

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. :)

jpdocdave 05-22-2009 01:52 PM

Quote:

Originally Posted by Sb5551 (Post 375959)
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.

DUCKIT 05-22-2009 07:41 PM

Quote:

Originally Posted by jerry bransford (Post 375990)
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

njkeagle 05-22-2009 10:31 PM

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

JFT80 05-23-2009 12:49 PM

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.

jpdocdave 05-23-2009 04:27 PM

40psi!!! who's they?

mikes139 05-23-2009 06:42 PM

When I was running 33's I went around with about 20 to 25 psi in mine.

Bigstonz 05-24-2009 06:24 PM

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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