這是給車輪配重用的，這一小鐵塊是在給車輪做動平衡的情況下加上的。汽車的輪胎並非每個地方位置的重量和基本都相似，輪圈也不一定是每個地方位置的重量基本都相似。
在輪胎安裝到輪圈上以後，整個車輪也不一定是每個地方位置的重量基本都相似。假如車輪每個地方位置的重量不相同，那在車輪高速旋轉時那麼就會出現不正常發抖震動的狀況假如車輪出現了不正常發抖震動的狀況，會影響汽車的操控性和駕駛穩定性.理所當然，才需要給車輪做動平衡。
在做動平衡時，需要在重量較輕的地方位置加上小鐵塊實行配重在每次更換完新的輪胎後，基本都要給每個車輪從新做一下動平衡測試，這樣子可以避免高速駕駛時車輪出現不正常發抖震動現象。
在平時用車時要重視自己汽車的輪胎，輪胎是汽車上惟一與地面接觸的部件，輪胎關乎到汽車的駕駛穩定性和駕駛安全係數。
輪胎是橡膠製品，橡膠製品長時間使用會發生老化現象，理所當然輪胎是需要定期更換的。
在平時用車時，一定要定期更換輪胎。正常狀況下，輪胎安裝在汽車上是可以用四年的，理所當然提倡各位每隔四年更換一次輪胎在購買新的輪胎時，一定要看清楚生產日期。
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This is for the counterweight of the wheel. This small piece of iron is added when the wheel is being balanced. The tyres of a car are not all of the same weight in every place, nor are the rims of a car all of the same weight in every place.
After the tyre has been fitted to the rim, the weight of the entire wheel is not necessarily similar in every place. If the weight of the wheel is not the same in every place, then the wheel will shake and vibrate abnormally at high speeds. It is only logical that the wheels need to be balanced.
After each new tyre change, it is basically necessary to give each wheel a new dynamic balancing test, which can prevent the wheels from shaking and vibrating at high speeds.
The tyres are the only parts of the car that come into contact with the ground, and they have a bearing on the stability and safety of the car.
Tyres are made of rubber and will deteriorate over time, so of course they need to be replaced regularly.
When using a car, it is important to change the tyres regularly. Under normal conditions, tyres can be installed on the car for four years, so it is logical to advocate that you should replace your tyres every four years.
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