Many car owners have encountered this situation, where they normally perform four-wheel shifting and dynamic balancing, but there is a deviation phenomenon. Originally, the car is normal and does not deviate. What is the problem?

        
This situation is a problem with the tires. I even encountered a new car that only drove 10000 or 20000 kilometers without reversing the wheels, and even experienced deviation. However, during the four-wheel alignment, I found that the data was normal, which was all due to tire issues. The deviation that occurs after reversing the wheel has nothing to do with four-wheel positioning. Don't blindly do positioning. Replacing the tire cannot change the positioning data. It turned out to be normal, but it must also be normal after reversing the wheel. There is no problem with positioning, ultimately it is still due to the tires, which are mostly related to their own wear and tear. When the tires are in their original position on the car, there is already differential wear on the left and right wheels, which means that the wear on the left and right sides is not consistent. Before reversing the wheel, they were in the rear wheel, and small differences would not feel abnormal. After reversing the wheel, they would feel a slight deviation when they hit the front wheel.
        
It is also related to the road being driven. Most urban main and secondary roads are high in the middle and low on both sides, which is conducive to drainage design and tends to deviate to the right. If there is a difference in the tires on both sides, there is also a tendency to deviate to the right. When the two are combined, the driver can feel it. How should we solve it? Just swap the positions of the left and right front wheels, including when the new car deviates and the four-wheel alignment data is normal. If the left and right wheels are reversed again, the vast majority of cars can return to normal. There will be no deviation to the other side again, unless the tire wear is very inconsistent.
        
   If the left and right wheels are reversed again, isn't the order of the four wheel rotation incorrect? Indeed, due to the occurrence of deviation, it is also a last resort, as the car is also very tiring to drive due to deviation. However, although the sequence is incorrect, the impact is not significant. It is still that the front wheel is changed to the rear wheel, and the rear wheel is changed to the front wheel, only left and right, which has no impact on the overall wear speed of the tires. If you are particularly concerned about the sequence of four-wheel rotation, you can also switch left and right after driving thousands of kilometers, which may cause wear and tear over a certain distance, so that you won't deviate.

        Finally, if there is a deviation after reversing the wheels, first measure the tire pressure. Sometimes, differences in tire pressure between the left and right front tires can cause deviation, while differences in rear wheel pressure generally do not cause deviation. I have encountered some car tires with a pressure difference of 0.2 or 0.3, which leads to deviation. After the tire pressure is charged to the same left and right, it returns to normal. However, some cars have a tire pressure difference of 0.2 or 0.3 and will not deviate, with slight differences between different cars. Another thing to know is that deviation is not related to dynamic balance. At the 4S store, the reverse wheel will definitely perform dynamic balancing, and there is also a relatively high labor cost. In a small roadside repair shop, reversing the wheel may not be balanced, and simply reversing the wheel will result in very low labor costs. If there is deviation without doing so, don't look for dynamic balance issues anymore, it's okay. Dynamic balance is to prevent the steering wheel from shaking during high-speed driving. If the steering wheel does not shake during high-speed driving, it indicates that the tires are balanced.

From: WONDEE Autoparts 2023-9-4