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Between two similar rubber compounds of different widths the coefficient of friction will be the same, but what gives you more straight line traction is the force distribution. At the point of contact between tire and road when not doing a burnout, also known as slipping, the relative speed of each is zero. If you try to grip 500ft lbs with a contact area of 3in^2 then it probably won't work very well, but if you increase that area to 3ft^2 your chances of it not slipping by breaking it's physical limits of traction also increase. Someone please correct me if I'm wrong though. It's been a long summer vacation.
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