Originally Posted By: rooflessVW
There is no pressure difference between brands. The psi listed on the sidewall is irrelevant. Run what your door jamb says, not the tire.
Make sure the tire you buy is the correct load range for your vehicle.
Mmmmm sorry there is a LOT of relevance to the psi listed on the sidewall. If you put a max 35psi tire on a vehicle calling for 50psi, for example.
FYI many truck owner's manuals have different pressures depending on estimated or actual load, which may differ from the door placard.
From experience, I can say that the 30(IIRC)psi recommended for my 2004 Jeep Grand Cherokee left the outer edges VERY worn compared to the center, and that at 40psi I got nice even wear. Yes, the ride firmed up also.