Both sides of the tire are badly worn. Why?

1. Early wear of tire center (crown): The main reason is over inflation. Properly increasing tire inflation can reduce tire rolling resistance and save fuel. However, if the tire is inflated too much, it will not only affect the shock absorption performance of the tire, but also lead to excessive deformation of the tire and reduce the contact area with the ground, so normal wear can only be borne by the central part of the tread, resulting in early wear.

2. Excessive wear on both sides of the tire (shoulder): The main reason is insufficient inflation or long-term overload driving. When the inflation amount is small or the load is heavy, the contact surface between the tire and the ground is large, which makes both sides of the tire contact with the ground to participate in the work, resulting in early wear. The tire pressure is higher or lower than the rated value by 20%, and the mileage loss is 20% ~ 25%.

3. Excessive wear on one side of the tire: The main reason is incorrect positioning of the front wheel. When the camber angle of the front wheel is too large, the outer edge of the tire will form early wear; When the camber angle is too small or too small, the inner edge of the tire forms early wear.

4. The left and right front shoulders are wavy, and the inside of the left rear wheel and the outside of the right rear wheel are abnormally worn. The main reason is that the front and rear axles are not parallel, and the right side of the wheelbase is larger than the left side, which exceeds the standard. The standard wheelbase (measured on the front and rear axle leaf spring seats) differs by a maximum of 4 mm on the left and right sides. The solution is to solve the leaf spring car by screening and adjusting the length of leaf spring. Adjust the push rod length of air suspension vehicles.

5. The left and right front shoulders are wavy, and the inside of the right rear wheel and the outside of the left rear wheel are abnormally worn. The reason is that the front and rear axles are not parallel, and the left wheelbase is larger than the right wheelbase, which exceeds the standard.

Secondly, the common causes of tire wear are as follows.

1. The positioning of four wheels is inaccurate: if four tires are not on the horizontal and vertical straight lines required by the standard, then two wheels on the same side will eat tires when driving; Or the front wheel or the rear wheel, mainly because the vehicle does not walk in a straight line and corrects itself, which leads to the abnormal increase of friction between a certain part of the tire and the ground and accelerates wear.

2. Incorrect toe-in adjustment: it will also lead to fetal eating. Toe is the angle at which the front wheel leans slightly inward, which is similar to the inner picture and is the best angle for high-speed and stable driving. All cars have their own toe angle, even if this angle is not properly adjusted, they will eat tires.

3. Steering gear failure: it will also cause tire biting and deviation.

4. Uneven and missing girders can also cause tire gnawing: For example, some accident cars have tire gnawing because the girder body is deformed.

If the air pressure of each tire is too different, you will eat the tire: the reason is the same, that is, imbalance.

6. Tires of different specifications will eat tires when mixed together: The reason is the same, that is, the four feet are uncoordinated, and they will eat tires when working in a stable environment.

7. Long-term tire pressure is too high or too low: Too high or too low tire pressure will cause uneven contact between the tire and the ground, leading to tire biting.