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post #1 of 4 Old 10-25-2013, 04:32 AM Thread Starter
drmadcat
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Tyre pressure

Sorry to bring this up again

I have Mickey Thompson STZ 245 70 16 on my WJ

The tyre place told me to put 40psi in which i thought they should have 33psi, when i went and checked them they had 44psi in. When they have 33psi in they look too flat so no real idea what pressure to run them at.

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post #2 of 4 Old 10-25-2013, 05:24 AM
Duh
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I like 35 cold in my 265/70r17. Wont pass forty hot. Nice good print, minimal bulge.
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post #3 of 4 Old 10-25-2013, 07:40 AM
ChrisHager
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Since you don't have any information listed about your WJ, I'll split the difference on the weight. Feel free to recalculate if you need to adjust the weight estimations.

WJ Weight: 4200lbs
Cargo: 400lbs
Max Load (for your listed tire): 2910
Max PSI (for your listed tire): 80

4200 + 400 = 4600 overall weight
4600 / 4 = 1150 lbs per tire
1150 x 1.15 (15% margin of error) = 1322.5 lbs per tire
1322.5 / 2910 = 0.454 (indicating you are using 45% of the tire's max weight)
0.454 x 80 = 36.357

Calculations show 36 psi is probably your ideal pressure to aim at. Another way to be sure is to chalk test the tire.


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post #4 of 4 Old 10-25-2013, 11:37 AM Thread Starter
drmadcat
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Join Date: Oct 2013
Location: perth
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Quote:
Originally Posted by ChrisHager View Post
Since you don't have any information listed about your WJ, I'll split the difference on the weight. Feel free to recalculate if you need to adjust the weight estimations.

WJ Weight: 4200lbs
Cargo: 400lbs
Max Load (for your listed tire): 2910
Max PSI (for your listed tire): 80

4200 + 400 = 4600 overall weight
4600 / 4 = 1150 lbs per tire
1150 x 1.15 (15% margin of error) = 1322.5 lbs per tire
1322.5 / 2910 = 0.454 (indicating you are using 45% of the tire's max weight)
0.454 x 80 = 36.357

Calculations show 36 psi is probably your ideal pressure to aim at. Another way to be sure is to chalk test the tire.

Thank you for that chart
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