The frame is the frame of the scooter body, just like the bones of the human body. The main frame is like the human spine, connecting the parts of the whole body. If the frame is made of solid materials, reasonable design, and reliable welding, then the stability and safety of the whole scooter It will be very good, and the use of a single-tube frame is a good way. This way of scooter models, often the frame can be guaranteed for life, because there will be no problems at all. As for the branch welding of the frame, it can be seen that the production process is good or bad. The good manufacturers have solid welding processes and smooth transitions, while the products of small workshops have rough welding and different shapes.