The rear suspension can consist of several shock arrangements: The rear suspension supports the swingarm, which is attached via the swingarm pivot bolt to the frame and holds the axle of the rear wheel. There is another type of front suspension system which is Earles type which highly used in off-road motorcycles.
The front suspension is usually built into the front fork and may consist of telescoping tubes called fork tubes which contain the suspension inside or some multibar linkage that incorporate the suspension externally. Modern designs have the two wheels of a motorcycle connected to the chassis by a suspension arrangement, however ' chopper' style motorcycles often elect to forgo rear suspension, using a rigid frame. Plunger design suspensions, as on this BSA Bantam, were superseded by the swinging arm īuell motorcycles employed a similar design with the oil held in the swingarm and fuel held in the frame. It has since gained some cachet in the modern custom bike world too because of the space savings it can afford and the reference to an earlier era. Today it is a used on some " thumpers" (single-cylinder four-strokes) that usually have dry-sump lubrication requiring an external oil tank. It was widely unpopular and generally regarded as a bad idea at the time. Oil-in-frame (Oif) chassis, where the lubricating oil is stored in the frame of the motorcycle, was used for Vincent Motorcycles of the 1950s, and for a while during the 1970s on some NVT British motorcycles. Some motorcycles include the engine as a load-bearing stressed member this has been used all through motorcycle history but is now becoming more common. The frame includes the head tube that holds the front fork and allows it to pivot. Carbon fibre, titanium, and magnesium are used in a few very expensive custom frames. The frame is typically made from welded aluminium or steel (or alloy) struts, with the rear suspension being an integral component in the design.
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