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A motorcycle frame is a motorcycle's core structure. It supports the engine, provides a location for the steering and rear suspension , and supports the rider and any passenger or luggage. Also attached to the frame are the fuel tank and battery.
The frame is typically made from welded aluminium or steel (or alloy) struts, with the rear suspension being an integral component in the design. Carbon fibre, titanium, and magnesium are used in a few very expensive custom frames. The frame includes the head tube that holds the front fork and allows it to pivot.
The featherbed frame was a motorcycle frame invented by the McCandless brothers and offered to the British Norton motorcycle company to improve the performance of their racing motorcycles in 1950. It was considered revolutionary at the time, [ 2 ] [ 3 ] [ full citation needed ] and the best handling frame that a racer could have.
This frame was initially offered in the Softail Custom, a bike that took many styling cues from choppers, including the narrow 21" front wheel. Buyers looking for the chopper look had a plausible factory alternative, and interest in choppers declined. Leather clad, metal lowered seat, and 24 inch rise Ape Hanger handlebars.
Motorcycle design can be described as activities that define the appearance, function and engineering of motorcycles. Professionally it is a branch of industrial design , similar to automotive design using identical techniques and methodology, but confined by a set of conventions about what is acceptable to the buying public.
Bobbers are typically built around unmodified frames, while choppers use either highly modified or custom-made frames. [13] Chopper frames are often cut and welded into shape. A bobber is a motorcycle that has undergone a ‘bob-job’ (hence the moniker 'Bobber'), that is, had extraneous parts removed for simplicity and weight-reduction.
AJS racing motorcycle showing typical pre-unit construction engine and gearbox layout with mounting plates, slotted holes and screw-thread adjusters visible. Pre-unit construction, [1] also called separate construction, is a motorcycle engine architecture where the engine and gearbox are separate components with their own oil reservoirs, linked by a driving chain within a primary chaincase.
Antonio Cobas (Barcelona 1952 – April 14, 2004) was a Spanish Grand Prix motorcycle designer, constructor and mechanic who built world championship winning motorcycles. Cobas was credited with being the originator of the modern, aluminum frame chassis now used on many modern racing and production motorcycles.
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