Handle the control gear of the car tyre or truck tyre will concentrate the wear of the car tyre on the same contact surface, which will lead to the terrible wear of the local car tyres and shorten the service life. So we should handle the control gear in proper way. Some car owner like to park their cars on the road shoulder. In this condition, the car tyre is easily to suffer the extrusion and easily to lead to the breakage of the cord thread.