Many owners of auto repair shops do not know what kind of tire changer they should buy for their shops when they buy it. To make matters worse, most employers have no research or training on the tire changer. Buying the tire changer blindly may cause a certain gap between the purchased machine and the actual use. First of all, there could be a tire changer that has many functions you haven't heard of. The tire changer is very complex, such as the tire press wheel, the back arm, the auxiliary arm, the interchangeable bird, etc., but can these so-called functions be used in real operation? Not necessarily. So how should we choose the product has become a lot of auto shop owners question, next we will explain it.