On car tires, shoes and other such items, having less of the material in contact with the surface underneath increases traction. Why is that? Isn’t friction a function of the contacting area and speed?
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Wider tires are better in dry conditions as they have more surface area to grip, but can hydroplane when the surface conditions are wet.
Narrow tires have increased surface pressure and will be better under wet conditions (heavy rain, snow or ice).
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