Recommended air pressure for 35" tires on 20" rims? rims? - Ford Powerstroke Diesel Forum

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post #1 of 3 Old 06-18-2012, 04:04 PM Thread Starter
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Recommended air pressure for 35" tires on 20" rims? rims?

I read 50,60, etc. What's best? Thanks

2010 F-350
2008 BMW 550i
2002 Corvette Z06
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post #2 of 3 Old 06-18-2012, 04:30 PM
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Whatever your tires say on the side set to max psi
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post #3 of 3 Old 06-18-2012, 05:31 PM
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Quote:
Originally Posted by lariat 7.3 View Post
Whatever your tires say on the side set to max psi
The operative word there is 'MAX'. What is written right before that? Max load: xxxxlbs at 55psi max. Very few of us meet those requirements on a daily basis. I ran the tread out of the CENTER ONLY of two sets of 365/65-16 Toyos doing that.

OP, the best answer I have found for that question is that there isn't one standard number. Rim width, truck weight, what you are hauling all come in to play here. My suggestion, starting with a NEW set of tires, scrub chalk across the tread and inflate the tires. A trip around the block should net your results. If you have chalk on the outer shoulders, reduce psi. If you have no chalk, re-apply and increase psi. I run about 40~45 psi in my 315s on 16x10s with even tread wear.

I say NEW tires because worn tires may look like they are wearing evenly side to side, but a depth gauge will tell you otherwise if they were run at 'MAX PSI'.

Karl and his 2003 6.0

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