A Tire

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A tyre (North American English) or tyre (Commonwealth English except Canada) is a ring-shaped component that surrounds the rim of a wheel to transfer a vehicle's load from the axle to the ground and to create traction on the surface over which the wheel travels. Most tyres, such as those used on automobiles and bicycles, are pneumatically inflated structures that also serve as a flexible cushion to absorb shock as the tyre rolls over uneven surface features. Tyres offer a footprint, known as a contact patch, that is meant to balance the weight of the vehicle with the bearing strength of the surface over which it rolls by producing a bearing pressure that does not deform the surface excessively.