Does anyone have the 235/75/15 105s tire listed as stock tire size on the placard and what is the recommended pressure listed on the sticker? I have 235/70/15 102s on my placard but the truck has the 75's installed. 32psi seems a bit harsh of a ride and according the the load charts 28 or 29 is the correct psi for that load rating on the 75's. Just wondering what GM spec is.

 

If you use the pressure listed on the placard, it will give a softer ride, lower fuel mileage, and shorter tire life. If that's what you want, go for it On the sidewall of the tire it will tell the maximum inflation pressure. For the best tire wear and fuel mileage, decrease pressure by 10% of the maximum. For example, if it indicates max inflation of 44psi, set them to 40psi.

 

That's too hard a ride for me. Our roads are pot hole city here I'd end up out of alignment real quick and that would cause abnormal wear shortening tire life anyway.