The rubber part of a wheel attached to the rim. Tires usually have an air filled inner tube inside. Some manufacturers offer solid foam rubber or polyurethane tires. Tires sizes vary from width to height. Tire tread design will also vary.
A tire or tyre (see spelling differences and etymological origins) is a device covering the circumference of a wheel. It is an essential part of most ground vehicles and is used to dampen the oscillations caused by irregularities in the road surface, to protect the wheel from wear and tear as well as to provide a high-friction bond between the vehicle and the ground to improve acceleration and handling. Today most tires, especially those fitted to motor vehicles, are manufactured from synthetic rubber or rubber composites, but other materials such as steel may be used for strength in the tire.