When the tire touches the ground, it will wear to some extent. After the car has been driving for a period of time, it is necessary to judge the positioning of the wheels. The four wheels can be adjusted to the same degree of wear as far as possible, and the wheels of the car can also be replaced regularly, which is helpful to help the tires reach the same degree of wear. According to Sylphy's automobile maintenance manual, the service life of tires should not exceed six years. When changing tires, be sure to change the same type of tires. Million car purchase subsidy