Many people believe that the eccentric wear of concrete mixer tire is caused by the out of tolerance of wheel camber, but in fact, the eccentric wear of tire is largely caused by the out of tolerance of toe in value. According to the experience summarized by technicians engaged in four-wheel alignment for many years and a large number of positioning detection data, it is considered that the correct toe in value can effectively avoid the eccentric wear of tire.

還有一種輪胎偏磨是轉向輪較大總轉角的超差、車輪外傾角和主銷傾角的不正確導致的，混凝土攪拌車在實際的行駛中，大多數是直線行駛的，轉彎、倒車和掉頭時的較大總轉角的時間不多，所以由此引發(fā)的偏磨比較少。

Another kind of tire eccentric wear is caused by the out of tolerance of the large total angle of the steering wheel and the incorrect camber angle and kingpin angle. In the actual driving of the concrete mixer, most of them travel in a straight line. There is not much time for the large total angle during turning, reversing and turning, so the eccentric wear caused by this is relatively small.

混凝土攪拌車輪胎與地面接觸時的柔韌性和隨意變形的特性很大程度上抵消了因車輪外傾角可能造成的輪胎偏磨，即便是高壓輪胎超差的車輪外傾角對輪胎的磨損影響也不大，有很多的廂式貨車在空車的時候為了減少輪胎與地面的摩擦、降低滾動阻力而專門設計了可變后輪外傾角。

The flexibility and random deformation characteristics of concrete mixer tires when contacting the ground largely offset the tire eccentric wear caused by wheel camber. Even if the wheel camber of high-pressure tires is out of tolerance, it has little impact on tire wear. Many Van trucks are empty in order to reduce the friction between tires and the ground Variable rear wheel camber is specially designed to reduce rolling resistance.

從設計上考慮，為了約束混凝土攪拌車在直線行駛中車輪外傾角造成的輪胎偏磨，對攪拌車設定了特定的前束值，由于攪拌車行駛不同的路面情況和顛簸、沖撞、機件磨損等因素的存在，即使是較堅固的攪拌車，它原有的定位角度都要不同程度的因上述原因逐漸改變原前束值。有的數值一發(fā)生變化，在行駛過程中就能感覺到，比如主銷后傾角、車輪外傾角、比較嚴重的后輪前束值的改變。

In terms of design, in order to restrict the tire eccentric wear caused by the camber angle of the concrete mixer truck when driving in a straight line, a specific toe in value is set for the mixer truck. Due to the different road conditions of the mixer truck and the existence of factors such as bumping, collision and wear of parts, even a relatively solid mixer truck, Its original positioning angle should gradually change the original toe in value due to the above reasons. Some values can be felt during driving as soon as they change, such as kingpin caster, wheel camber and more serious rear wheel toe in.