Abstract
Tires are made to grip the road surface when the vehicle is being steered, accelerated, braked, and/or negotiating a corner. Therefore, the ability to control the tire to ground interaction is of fundamental importance. Road grip or friction is a property that resists the sliding of the tire over the road surface because of a retardant force generated at the tire to ground contact area. A modern compound rubber tire will develop a higher coefficient of friction than natural rubber. In both cases, their values decrease as the road surface changes from dry to a wet condition. The rate of fall in the coefficient of friction is far greater with a worn tire tread as opposed to a new tire as the degree of road surface wetness increases. The outside carcass and tread of a tire is made from a rubber compound that is a mix of several substances, to produce a combination of properties necessary for the tire to function effectively. Most metallic materials are derived from simple molecules held together by electrostatic bonds that sustain only a limited amount of stretch when subjected to tension.
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