The small iron block on the wheel hub of an automobile is the wheel hub balance block, which is a counterweight component installed on the wheel of the vehicle. The function of the balance weight is to keep the wheels in dynamic balance at high speed.

The mass of every part of any object is different. In the case of static and low-speed rotation, uneven mass will affect the stability of object rotation. The higher the rotating speed, the greater the vibration. The function of the counterweight is to reduce the mass gap of the wheel as much as possible and achieve a relatively balanced state.

Because the driving mode of a car is generally the front wheel, and the load of the front wheel is greater than that of the rear wheel, the tire fatigue wear degree of different parts will be different after a certain mileage of the car, and it can be transposed according to mileage or road conditions. Due to the complicated road conditions.

Any situation on the road may have an impact on tires and rims, such as colliding with road platforms and passing through potholes at high speed, which will easily lead to rim deformation. At this time, it is necessary to do a good job of tire dynamic balance while transposition. If the balance weight is replaced and the dynamic balance still doesn't work, the hub must be repaired. The deformed hub will not only shake the car, but also be unsafe.