The frame parts are the basic structures that constitute the bicycle, as well as the skeleton and main body of the bicycle, and other parts are also directly or indirectly installed on the frame. There are many structural forms of frame components, but they can be generally divided into two categories: men's frames and women's frames.
       The frame is generally welded and combined with ordinary carbon copper tubes. To reduce tube weight and increase strength, higher-end bikes are built with low-alloy steel tubes. In order to reduce the resistance in fast driving, some bicycles also use streamlined steel pipes.        Since the bicycle is driven by the human body's own driving force and riding skills, the frame becomes an important structure to withstand the impact load generated by the bicycle and whether it can carry the human body comfortably and safely. The quality of the ride will directly affect the safety, stability, and lightness of the ride. Generally speaking, the spokes are of equal diameter. In order to reduce gravity, there are also variable-diameter spokes with large ends and small middle ones, and flat and streamlined spokes in order to reduce air resistance.