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Question
I own a 2013 Tahoe with P285/45 R22 Bridgestone dueler H/L tires. All info only talks about 20 inch tires and not 22inch tires for proper air pressure.

Answer
DMClark,

The information on inflation pressure - as you found out - is tied to the tire size.  The key to understanding what to do is to understand that you are trying to match both the load carrying capacity or the spring rate - and if you can do both, that's great!

According to Tire Guides, the vehicle tire placard on a 2013 Chevy Tahoe should say a P265/70R17 113S is 30 psi front and rear - or for a P275/55R20 111S is 32 psi front and rear.

Now a P285/45R22 is commonly a 110 load index, so that means about 3 psi more than a 113 LI or 1 psi more than a 111 LI = 33 psi.

Now since that is HIGHER than what is specified for inflation pressure for the OE sizes, you can not use the lower pressure to match spring rates (which is very closely tied to inflation pressure.)  

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Barry Smith

Expertise

I have over 30 years experience in the design, manufacturing, and testing of tires. I have served as the technical advisor to the "800" number. I have authored or co-authored many publications - usually without credit. I can answer almost any technical question, but please don`t ask me to compare brands. I probably have prejudices because of my work experience.

Experience

Member SAE (Society of Automotive Engineers) Member Tire Society (Tire Technical Organization) SCCA Regional Competiton License holder Authored many training manuals on tires, their care and use.

Organizations
SAE (Society of Automotive Engineers) SCCA (Sports Car Club of America) Tire Society

Publications
You may want to visit my web site: http://www.barrystiretech.com/index.html

Education/Credentials
I am a graduate of the University of Dayton, Dayton, OH - BME, 1971 I attended graduate school at the University of Akron - but did not complete my PhD - something I regret.

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