What is dynamic balance? Generally speaking, the wheel rotates around the center of the circle, and only when the mass distribution of each point of the wheel is uniform can it rotate smoothly, that is, it can achieve a state of dynamic balance. If a point is particularly heavy, it will shake when rotating. Take the electric fan as an example. If a heavy object is tied to the wings of the electric fan or the wings are slightly broken, the mass distribution around the center of the circle will become uneven, unstable and vibrate greatly. The same is true for tires. After imbalance, the vibration will be greater, which will be transmitted to the steering wheel, making the steering wheel shake seriously.
The purpose of changing tires back and forth is to prevent tires from wearing in one direction for a long time. Changing the tire position regularly is to make the tire wear balanced, which is conducive to the smooth operation and safe driving of the car, and ultimately can prolong the service life of the tire. Various tire positioning methods are different, because not all cars have the same driving wheels. According to the actual situation of the car, the correct interchange method should be observed, because the car is divided into front-wheel drive, rear-wheel drive and four-wheel drive, and the interchange method is different. The correct way is to change the front drive wheel vertically, from front left to rear left and from front right to rear right. Non-driving wheels change diagonally, from right rear to left front, and from left rear to right front. In other words, the principle of tire transposition for non-four-wheel-drive vehicles is that the driving wheels are replaced vertically and the non-driving wheels are replaced obliquely.
The purpose of tire transposition is to reduce tire eccentric wear. In order to ensure the stability of the vehicle and prevent jitter, the rear wheels of general vehicles are not absolutely perpendicular to the ground, and there will be some external splays. This arrangement will also cause serious wear on the inside of the rear wheel. Of course, most of the car data are reasonable. If the chassis is not impacted, the wear degree is always within the acceptable range, and the normal service life of the tire is 654.38 million kilometers or 4 years. It is difficult for most family cars to run so many miles. Basically, it's time to change the tire. If the tire is not badly worn, it may need to be completely replaced before it needs to be replaced.