If the engine is the "heart" of the motorcycle, then the frame is the "skeleton" of the motorcycle. The frame is closely related to the handling performance and riding comfort of the motorcycle. The frame supports the engine, provides a fixed position for the steering mechanism and rear shock absorber, carries the rider, passengers and their luggage, in addition to providing mounting places for the fuel tank, battery, etc., and so on.

Take apart the outer casing of the motorcycle and remove the fuel tank, air chamber, battery and other accessories, and you will see the role of these "bones" more clearly: at the front of the frame, we will find that the steering head pipe is installed here; At the rear of the frame, you'll see the swingarm joins the frame here. Some frames hug the engine tightly in order to enhance the overall rigidity of the frame; but there are also the opposite, some motorcycles do not have a frame in the strict sense, you only see the front subframe and the rear subframe directly mounted on the engine

There are many types of motorcycle frame materials. Early motorcycles are actually bicycles + engines, so the most common frame material is the steel pipe of the bicycle. With the development of material technology bringing new possibilities, and with the inherent requirements of motorcycle performance improvement, there are more choices for frame materials. In addition to common steel, various materials such as aluminum alloy, magnesium alloy, titanium alloy, and carbon fiber are available. It was used, and a frame made of a mixture of various materials also appeared.

There are various types of frames, and the materials of the frames are colorful. It should be pointed out that there is no perfect frame that can conquer the world. Which structure and material to choose for a specific type of motorcycle frame involves model positioning, mass distribution, required rigidity, dynamic performance, speed, and function. Factors such as usage and sales price are actually the final balanced result of a comprehensive optimization comparison.