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The design is similar to a gear simple innovation, and the wheel hub forms a concentric circle, the radius is slightly smaller than the hub, in each gear front end are provided with telescopic device. When required by the car wheel braking device is extended to 1~2 cm, the circular tires are integrated into a kind of round multilateral body, increase the tire to the ground, thereby increasing the frictional resistance, so the vehicle can smooth starting running and stop.
DuanYu ZhangYu GuoYanrong