[bet993]

I am sorry I have to disagree to a point with some of this discussion. There is no good general rule for tire pressures, except to follow the manufacturer’s recommended tire pressure for the original equipment on the vehicle.

Each vehicle and application is unique. Tire construction, wheel size, driving conditions, temperatures, etc. all play important roles in determining what the proper tire pressures should be. Some vehicles even have different pressure for front and rear. Notwithstanding, the effect the pressure has on the wear of a tire, adjusting the tire pressures effects the handling of the vehicle, which can result in more over-steer or under-steer.

Not to pick on JDookie but 35psi is not a good round number to just throw out to the general public. 35 psi on the 18” rear wheels, of my rear engined 996 would result in rim damage and/or tire damage on all but the sedatest driving and/or on the smoothest roads. The factory recommendations for the rear tires on my car are 44 psi (fronts are 36psi).

The biggest problem with discussions like this on a board like Autopia is the vast differences in cars and applications being used. What is good for the corvette owner is not good for the Honda accord owner, which isn’t good for the Honda accord owner with aftermarket 19” rims, which is not good for the F150 owner, etc.