Global Business Group HIHO

Hub technical knowledge

When upgrading and refitting our car, the replacement of wheel hub is an essential item for many riders. When we go to replace the wheel hub, there are many different styles and models of wheel hubs to choose from, which often makes us dizzy. However, there are many things to pay attention to when replacing aluminum wheels. The first thing to bear the brunt is the difference in appearance and shape. Our riders often treat appearance and shape as the focus of refitting. However, the difference of aluminum wheel hub is not only the shape, but also the setting value of original wheel hub parameters, which is most often ignored by us. Now I'll explain to you some parameters and precautions of the original wheel hub.

First, we should understand the PCD value and hole location. First understand the definitions of these two. The hole position refers to the number of locking nuts when the rim is fixed. The general number is 4 to 5 holes. PCD value is the diameter of connecting these holes to form a circle. In order to adapt to two different PCD values, some rims are often drilled with 8 holes.

Secondly, we want to talk about the offset of the wheel hub. First introduce the definition of the lower offset value, which means that the distance from the center line (Meridian) of the rim cross section to the fixed datum plane of the screw hole is positive for general passenger cars and negative for a few vehicles and some jeeps. For example, if the offset value of a vehicle is et45 and the aluminum hub of ET50 is replaced, it will be more retracted into the wheel arch than the original hub. This setting is closely related to wheel alignment angle and vehicle steering characteristics. We should pay attention that the offset value with too large gap may cause the bearing to be easily worn, very worn to the tire, and even lead to tire burst during high-speed driving. Therefore, we must be careful when replacing the wheel hub.