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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. If you want to carry extra weight in a SUV or truck, like a concrete statue you wife had to have on vacation and the normal pressure is 32 the tire might have a max pressure of 45, you could pump the tires to 45 and take them back down after the trip.
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. They will adjust that if the car tends to oversteer or understeer, but lean towards understeer. That tire pressure is the same for summer, all season, snow or mud tires. For street driving this will change very little with a larger size, competition driving is completly different.
Joe
TheTireShoppe
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