Here's confirmation of coefficient changing. Lower pressure --> higher coefficient of friction
*All Things Motorcycle* - Tire Traction. Is contact patch size important?
Quote:
Foale, on page 2-27 of Motorcycle Handling and Chassis Design, says that "this coefficient [of friction] is not constant but usually decreases with vertical load. This effect varies between tyre types but the reduction is of the order of 10% for a doubling of load. A further complication is that this relationship is not linear. This has far-reaching implication and is one reason for the general increase in tyre section on racing and sports machines, because, for a given wheel load, the bigger the section the lower the contact-patch pressure and so the greater the coefficient of friction, hence grip on the road." (Emphasis mine again.)
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Edit: He quoted the wrong page. It's
2-17
