The inside of the two rear wheels is badly worn?

For example, when maintaining a car years ago, it was found that both rear wheels were seriously worn by the inside of the car, with smooth patterns and normal outside. A friend said that the quality of the control arm of the domestic car was not good, and it became soft and deformed after a long time. I went to the 4S shop and told the manufacturer to replace the two control arms of the rear wheel. I didn't dare to get on the high speed without changing the tires. Who has ever been in this situation? The internal wear of Tesla's rear tires is very serious. Why did the 4S shop find it twice? Make sure there is something wrong with the control arm. I promise to change the control arm. In addition, I spent 400 yuan to buy two new tires from Tong Jia. The last problem that the steep slope with throttle does not respond has not been solved, and the urban roads will not affect it. We'll wait until the tire problem is solved. Causes of serious inner wear of two rear tires: (1) The tires are worn normally, and the spare tire cannot be used for a long time. The spare tire material is generally poor, so the wear will be more serious. (2) The reason of unilateral wear is that the tire leans inward or outward. Mechanical defects can be corrected by four-wheel alignment. The solution to the serious inner wear of two rear tires of automobiles: (1) Go to a professional repair shop to replace new tires; (2) Go to a professional repair shop for four-wheel alignment non-single steering tire transposition: 1. The full-size spare tire 5000km tire is transposed once, and the balance needs to be moved every time, and the five-wheel counterclockwise cycle transposition method can be adopted. That is to say, at the first transposition, the spare tire is moved to the right front position. Right rear, left front, left front to left rear, left rear to right rear. The second time is the same. Ran 40 thousand kilometers, the pattern is the same. This method can be used continuously. If you think which pattern is a little shallow, use it as a spare tire, and the others will be transposed circularly. 2. riders with small spare tires and non-full size can use the cross transposition method. It is also necessary to strike a balance. It can be 5000-65438. That is, right front and right rear, left front and left rear are interchanged. Next time right front and left rear, left front and right rear are interchanged, and so on. (It is to ensure that each wheel is in a different position and stays in the early stage. Because the stress points at each position are different, it will cause different tire wear, so each tire will be subjected to different environments. In this way, the tire wear will be consistent and reach the maximum service life).