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Automatic tire chains are permanently mounted near the drive tires and engage by turning a switch, then move into position to fling the pieces of chain under the tires automatically. Automatic chains were invented in 1941 in the United States [1] and Sweden in 1977 [citation needed]. Snow chains, or tire chains, are devices fitted to the tires ...
The following outline is provided as an overview of and topical guide to tires: Tire (North American) or tyre (British) – ring-shaped covering that fits around a wheel rim to protect it and enable better vehicle performance by providing a flexible cushion that absorbs shock while keeping the wheel in close contact with the ground.
The underside view shows the arrangement of the 18 tires (wheels). Shown in blue in the underside view are the axles, drive shaft, and differentials. The legend for labeled parts of the truck is as follows: tractor unit; semi-trailer (detachable) engine compartment; cabin; sleeper (not present in all trucks) air dam; fuel tanks; fifth-wheel ...
Prior to 1964, tires were all made to a 90% aspect ratio. Tire size was specified as the tire width in inches and the diameter in inches – for example, 6.50-15. [24] From 1965 to the early 1970s, tires were made to an 80% aspect ratio. Tire size was again specified by width in inches and diameter in inches.
Protrusions molded into rubber tractor tire treads are known as lugs, as are cleats for round wheels, [citation needed] which perform a similar function. Unlike metal grousers, these rubber tire treads or crawler-track shoes/pads may be more suitable for driving on roads. [7] Grousers on a captured World War I British tank.
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