The frame is the "skeleton" of a motorcycle, supporting the engine, providing a fixed position for the steering mechanism and rear shock absorber, carrying the rider, passengers and luggage, and providing a mounting position for the fuel tank, battery, etc., and is closely related to the handling performance and riding comfort of the motorcycle . The frame undertakes tasks such as load-bearing, force-bearing, and steering control.
The specific structure and material selection of the frame is the result of comprehensive optimization and comparison, and needs to take into account factors such as model positioning, weight distribution, required rigidity, power performance, speed, functional use, and sales price. At the front of the frame, the steering head tube is installed; at the rear of the frame, the rear swingarm is connected to the frame.
There are many types of frame materials. Early motorcycle frames were mostly made of steel tubes. With the development of material technology and the requirements for performance improvement, various materials such as aluminum alloy, magnesium alloy, titanium alloy, and carbon fiber have been used, and frames made of a mixture of various materials have also appeared.
