What does wheel J-value mean?

The wheel J-value refers to the shape and height of the hub flange. Generally speaking, we will use numbers to indicate the width of the wheel hub, such as 7J, 8J, where J represents the shape and height of the hub flange. In addition to J, there are also different types, such as C, JJ, JK, K, etc. The difference between them mainly lies in the difference in convex height, among which C is the lowest, K is the highest, and J is the most common wheel hub type. In addition, the size of the wheel hub refers to the diameter of the wheel hub. We can usually hear the terms 15-inch wheel hub and 16-inch wheel hub. The number refers to the diameter of the wheel hub. If the wheel hub size is large, the flatness ratio of the tire will be higher, which can visually tighten the wheel, and the stability of the car's control will also increase, but the fuel consumption will also increase accordingly. The width of the rim will also affect the aspect ratio and width of the chosen tire.