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Pneumatic tires can greatly reduce rolling resistance and improve comfort. Wire spokes are under tension, not compression, making it possible for the wheel to be both stiff and light. Early radially-spoked wire wheels gave rise to tangentially-spoked wire wheels, which were widely used on cars into the late 20th century.
Others use rim to mean the entire metal part to which the tire mounts, [20] because the rim and the wheel are often cast or stamped from a single piece of metal instead of being distinct as with wire wheels. At the same time, "wheel" may refer to the entire rotating assembly, including the tire.
Vehicles typically carry a spare tire, already mounted on a wheel rim, to be used in the event of a flat tire or blowout.Spare tires (sometimes called "doughnuts") for modern cars are smaller than regular tires (to save trunk space, weight and cost) and should not be used to drive very far before replacement with a full-size tire.
The tires on a Hummer H1 might be labeled: 37X12.5R17LT. 37 – the tire is 37 in (940 mm) in diameter; 12.5 – the tire has a cross section of 12.5 in (320 mm) R – this is a radial tire; 17 – this tire fits 17 in (430 mm) rims; LT – this is a light truck tire
Following the 1968 Consumer Reports announcement of the superiority of the radial design, radial tires began an inexorable climb in market share, reaching 100% of the North American market in the 1980s. [20] Radial tire technology is now the standard design for essentially all automotive tires, but other methods have been used. [26]
Alternatively, smaller wheels are chosen to fit a specific style of vehicle. An example of this is the Lowrider Culture in which smaller wheels are largely desired. Wheels can be widened to allow for a wider tire to be used and to poke the wheel out to the fender of the vehicle.