Simply put, it keeps your wheels in a balanced state when rotating, making your driving more stable and safer. Many people confuse dynamic balancing with four-wheel alignment. In fact, they are different. Dynamic balancing adjusts the balance of the wheels, while four-wheel alignment adjusts the suspension.
As the saying goes, "a good horse deserves a good saddle." By extension, tires are also very important to keep the vehicle stable. However, we will always encounter some potholes and bumps on the road. After long-term impact, the mass distribution of the wheels will change. will be affected to a certain extent. In addition, since the tire itself has "small parts" such as valves, it is not absolutely balanced in a strict sense. The tire itself is also made of soft material, and the combination of the rim and tire cannot completely guarantee mass balance.
Therefore, after a long time, the wheels may become unbalanced. The most intuitive feeling at this time is that the steering wheel will shake regularly, which becomes more obvious the faster the vehicle speed. In severe cases, there will be a resonance feeling in the car. If you drive like this for a long time, it may cause eccentric tire wear in severe cases, endangering driving safety. If the wheel imbalance is serious, it may cause damage to the bearings and suspension in the long run, affecting the life of the mechanical structure. In addition, whether you are replacing a rim or replacing an old tire with a new one, even if nothing is replaced but the tire is removed from the rim for inspection, as long as the rim and tire are reassembled separately, dynamic balancing is required.
In the early days, we could always see something like this on the wheels: this is the external counterweight, but this is already a relatively primitive technology. It looks abrupt and not good-looking. There are many weight styles, and the basic There are weights in multiples of 5g, such as 10g, 20g, 40g, etc.
Nowadays, the mainstream is the internally attached counterweight block. The advantage is that it cannot be seen from the outside and does not affect the appearance. The weights of this type of counterweight block mainly include 5g and 10g. Most of the raw materials of counterweights on the early market were lead, so they were once commonly known as "lead blocks". Another raw material was zinc metal. However, because the prices of these metals are not cheap among ordinary metal materials, so Due to cost issues, they have gradually withdrawn from the counterweight market and been replaced by more affordable iron. Currently, the external or internal counterweights that can be seen on the market are basically made of iron. However, counterweights are not a panacea. If the lead weight on the inner side of the rim is far from balanced after using a 70-gram counterweight, then you need to consider using other methods because the weight is too heavy. If so, it may actually aggravate the vibration of the wheels.