Motorcycle frame

A motorcycle frame is a motorcycle's core structure. Its main function is to provide a torsionally rigid connection between the steering head at the front and the swinging-arm bearing at the rear for predictable handling and safety. It also supports the engine, the rider and any passenger or luggage. Also attached to the frame are the fuel tank and battery. At the front of the frame is found the steering head tube that holds the pivoting front fork, while at the rear there is a pivot point for the swingarm suspension motion. Some motorcycles include the engine as a load-bearing stressed member; while some other bikes do not use a single frame, but instead have a front and a rear subframe attached to the engine.

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