Lost_To_A_K-Car wrote:Originally posted by not_a_porsche "]That isn't true. Basically, given a constant vehicle weight the size of the contact patch will remain the same regardless of tire width.Please elaborate.
Ok, but this is from memory. The old thread is gone from my email where there was a discussion about this. In a nutshell, ff you put a wider rim/tire combo on a car without changing the O.D., laterally the contact patch will increase in width but will become shorter in longitude. This:------------| || || |------------ Becomes this:---------------| || |---------------
You can change the shape, but not the area because it's determined by weight and air pressure.
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This is slightly different than what I said, but describes why a wider tire will not net you more grip:
F=u*rwhere F=friction, u=coefficient of friction (a constant particular to the materials involved) and r=weight. The coefficients of friction of dry road surfaces generally range from 0.6 to 0.8. You can't get more grip unless you:A. increase the coefficient of frictionB. increase the weight. Note: Increasing the width of the contact patch will not alter A.