![]() ![]() Before rubber was developed, the first versions of tires were simply bands of metal fitted around wooden wheels to prevent wear and tear. ![]() The tread provides traction while the body provides containment for a quantity of compressed air. The materials of modern pneumatic tires are synthetic rubber, natural rubber, fabric and wire, along with carbon black and other chemical compounds. Tires provide a footprint, called a contact patch, that is designed to match the weight of the vehicle with the bearing strength of the surface that it rolls over by providing a bearing pressure that will not deform the surface excessively. Most tires, such as those for automobiles and bicycles, are pneumatically inflated structures, which also provide a flexible cushion that absorbs shock as the tire rolls over rough features on the surface. Tractor tires have substantial ribs and voids for traction in soft terrain.Ī tire ( American English) or tyre ( British English) is a ring-shaped component that surrounds a wheel's rim to transfer a vehicle's load from the axle through the wheel to the ground and to provide traction on the surface over which the wheel travels.
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