Quote:
Originally Posted by tireshoppe
The pressure printed on the tire is the maximum pressure, or not to exceed when cold. Some tires are rated for extra load, or a reinforced side wall and will have a higher max pressure. ...
The vehicle manufacturer calculates how much weight is put on each tire under loaded conditions not sitting still. They determine how many square inches of tire is on the ground and get PSI or pounds per square inch.
Joe
TheTireShoppe
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Thank you Joe for the explanation - I understand that but what I am questioning is the premise this is based on. If the vehicle manufacturer is basing the printed reccommended pressure on the PSI of the stock tires - wouldn't this be meaningless if I changed to a different tire by a different manufacturer. Some have stronger sidewalls, different compounds and compositions from others. I don't understand how the car manufacturer can make a blanket statement that really only applies to the specific stock tires the car has. And again, there are some instances when some cars have different tires by different companies on the same rims depending on what is in stock (like Chevy Cobalts for example - you will find some at dealerships that have the same rims but different tires). I would think the tire manufacturer should be the athority on what is reccommended based on the max and type of tire.
