mitsuguy

iTrader: (2)

Actually, maximum pressure has nothing to do with max pressure listed on the sidewall. All P-Metric tires carry their maximum load at 35 psi and all euro metric tires do the same at 36 psi I believe, aside from XL rated tires, which are 41 or 44 psi, as listed on the sidewall. So, lets say we have a Michelin tire with a 35 psi maximum pressure and a Bridgestone with 50 psi maximum pressure. We inspect the door placard and both tires are the same as original size (including p-metric, euro-metric, LT, etc) and the door says 32 psi. It doesn't matter which brand tire is on the car or the tires maximum air pressure, Lexus recommends 32 psi. The reason some tires have higher maximum pressures is not to carry extra weight (in these passenger car style tires at least), but to tune how the vehicle and tire handles... higher pressure generally reduces tire roll during a turn and a change in air pressure can dramatically change how a tire handles.

lexo98

iTrader: (2)

MItsuguy's right. I sell both Michelin and Bridgestone tires. Im not sure what tire models, size and load ratings you are running on your vehicle. Basically if the Michelins on your vehicle are the exact size and load ratings as your door sticker it would probably be in your best interest to use the OE settings. Now if the sizes are the same and the load ratings are different there maybe some adjustments in the air pressure required for the vehicle to carry the same load as intended.