The pit bike is make of Non- welds of pure aluminum alloy two turns of motors frames, The trailing wheel, can go each kind of road and the sport athletic field, It is safe for pursues buys, the development is unprecedented origination in domestic and foreign motorcycles profession research. This product is made of 6063 high-purity aluminum alloys, by high tech, CNC processing center manufacture, the outlook is artistic, the structure is exquisite, the overall structure is ingenious. This shape of the frame is tenacious, small ldistortion and anti- impact, It is better than the ordinary, It is safe for driving.