I have seen large rear tires on many a (allegedly) high power RWD car, and have always thought they would increase traction. Just now I realized I have no idea why that would be. Given a tire with x cm^3 in contact with the ground and a given vehicle mass, there should be a certain pressure on the contact patch of the tire, if you make the tire twice as big, that pressure should drop by %50, the force remaining the same. Come to think of it, changing tire pressure changes the size of the contact patch, and I know from experience that changes traction, so why is that? Is traction just not linearly proportional to pressure/area?
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