Basic parameters of automotive wheel bearings are introduced to understand the pitch and width

An automotive wheel bearing includes many parameters, and each parameter affects the use of the vehicle, so these parameters must be confirmed before modifying and maintaining the hub. Size: The size of the hub is actually the diameter of the hub. We can often hear the 15 inch wheel and 16 inch wheel. The 15 and 16 inch refers to the size (diameter) of the wheel hub. Generally, in a car, if the size of the wheel is large and the flatness of the tire is high, it can visually exert a good tension effect, and the stability of the vehicle handling will also increase, but the fuel consumption increases accordingly. Such additional problems.

Width: The width of the hub is also known as the J value. The width of the hub directly affects the choice of the tire. For tires of the same size, the J value is different, and the flatness and width of the selected tire are different.

PCD and hole position: The professional name of PCD is the diameter of the pitch. It refers to the diameter between the fixing bolts in the center of the hub. The general porous position of the hub is 5 bolts and 4 bolts, but the distance between the bolts is different. So we can often hear the name 4X103, 5X114.3, 5X112, 5X114.3 as an example, the PCD representing this wheel is 114.3mm, and the hole is 5 bolts. When selecting the hub, the PCD is * an important parameter*. For safety and stability considerations, * it is better to choose the PCD that matches the original car for upgrade.

Offset: English is Offset, commonly known as ET value, the distance between the wheel bolt fixing surface and the geometric center line (the centerline of the hub cross section), which is simply the difference between the center screw seat of the hub and the center point of the entire wheel. It is popular to say that after the wheel is modified, it is inwardly retracted or protruded outward. For a typical car, the ET is positive and negative for a few vehicles and some jeep.

Center hole: The center hole is the part used to fix the connection with the vehicle. It is the position of the hub center and the hub concentric circle. The diameter size here affects whether we can ensure that the wheel center can match the geometric center of the wheel. (Although the wheel positioner can convert the hole distance, this modification is risky, users should be cautious to try).