tire air pressure on street - JeepForum.com
 
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post #1 of 8 Old 03-22-2008, 01:20 PM Thread Starter
jimG16
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tire air pressure on street

I'm running 33X12.5 maxxis bighorns and I'm wondering at what tire pressure i should be running them at. I want the tires to last as long as possible and what PSI is best for that.

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post #2 of 8 Old 03-22-2008, 01:23 PM
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I usually run at 30 psi for the street (33x12.5). Even then, not all of the tread contacts the road.

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post #3 of 8 Old 03-22-2008, 01:25 PM Thread Starter
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Is that bad? I couldnt really see that being much of a problem, what about PSI offroad
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post #4 of 8 Old 03-22-2008, 01:30 PM
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One way is to do a "chalk test". My kids have the big sidewalk chalk, it works really well. You put a patch of chalk down in front of each tire, drive over it and look at the pattern. Once you have even tread contact, you're done. I run about 26-28PSI in my MT/R's on the street.

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post #5 of 8 Old 03-22-2008, 01:30 PM
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Quote:
Originally Posted by jimG16 View Post
Is that bad? I couldnt really see that being much of a problem, what about PSI offroad
No it's not bad at all since it is small enough to be negligible. Sometimes I'll do 28 for the street. Usually I've seen most people run from between 28-32 psi on the road with 33x12.5s.

As for airing down, I go down to 12-13 psi. Works very well and I've never had any issues

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post #6 of 8 Old 03-22-2008, 01:32 PM
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Quote:
Originally Posted by jimG16 View Post
Is that bad? I couldnt really see that being much of a problem, what about PSI offroad
If you do the chalk test and let all the tread hit the road,your tires will be under inflated badly.(mine came out to be 16psi)I run 22psi for 35's and 26psi for 33's.Thats what Mickey Thompson Co.told me to run for my tires.
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post #7 of 8 Old 03-22-2008, 03:43 PM
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its going to depend alot on how heavy your jeep is (bumpers winch etc) and what tire your running. Some tires have very thick sidewalls and even when aired down to 12psi they barely even bulge out


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post #8 of 8 Old 03-22-2008, 08:16 PM
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Quote:
Originally Posted by Theboogieman View Post
If you do the chalk test and let all the tread hit the road,your tires will be under inflated badly.(mine came out to be 16psi)I run 22psi for 35's and 26psi for 33's.Thats what Mickey Thompson Co.told me to run for my tires.
When you do the chalk test, the goal is NOT to get all the tread to contact the road.
With 35x12/50s I'd have to air down to about 8 lbs to get the entire tread width to contact pavement.

The goal is to get what tread that does contact the road to wear evenly. If the center wears off first, you're overinflated. etc.


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