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A motorcycle fork is the portion of a motorcycle that holds the front wheel and allows one to steer. For handling, the front fork is the most critical part of a motorcycle. The combination of rake and trail determines how stable the motorcycle is. The 'fork' on a motorcycle consists of multiple components.
The basic motorcycle swingarm is a quadrilateral, with one short side connected to the motorcycle's frame with bearings so that it can pivot. [14] The other short side is the rear axle around which the rear wheel turns. The long sides are connected to the motorcycle's frame or rear sub-frame with one or two shocks with coil-over springs.
Unsprung mass is a consideration in the design of a vehicle's suspension and the materials chosen for its components. Beam axle suspensions, in which wheels on opposite sides are connected as a rigid unit, generally have greater unsprung mass than independent suspension systems, in which the wheels are suspended and allowed to move separately.
The risk of skidding increases if the motorcyclist is braking or changing direction. This is due to the fact that most of the braking and steering control are through the front wheel, while power is delivered through the rear wheel. [50] During maintenance, the choice of material can be inadequate for motorcycles.
Single-sided swingarms date from at least the late 1940s. In 1948, the Imme R100 produced by Norbert Riedel of Germany had both a single-sided front wheel suspension as well as a single-sided rear swingarm that doubled as the exhaust pipe. [3] In 1950 Moto Guzzi introduced the Galletto, a large-wheel step-through scooter.
For a sample motorcycle moving at 22 m/s (50 mph) that has a front wheel with a moment of inertia of 0.6 kg·m 2, turning the front wheel one degree in half a second generates a roll moment of 3.5 N·m. In comparison, the lateral force on the front tire as it tracks out from under the motorcycle reaches a maximum of 50 N.
With one spring above the rear axle and two below, [3] [4] the sprung hub provided about two inches of vertical travel [1] [5] and weighed 17 pounds (7.7 kg) more than a conventional hub. It was designed to allow rear suspension to be offered optionally without altering Triumph's existing frames. [ 1 ]
They were used on the first production motorcycle, the 1894–1897 Hildebrand & Wolfmüller, and have been on nearly all production and special motorcycles ever since. [5] [6] During this period tyre sizes were usually 22 to 28 inches (560 to 710 mm) diameter and 1 + 1 ⁄ 2 to 2 in (38 to 51 mm) wide. [6] A: Typical outer casing of a tyre.
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