Buses refer to special motor vehicles that usually follow a fixed route, have a dedicated road number, and carry passengers. The tire size is 9R22.5. In order to meet the multi-element needs of most bus markets, bus tires have recently developed new specifications for passenger transport.

The wheel hub is a cylindrical metal part with the inner contour supporting the tire and the center mounted on the axle. It is also called rim, steel rim, wheel and tire bell. There are many kinds of hubs according to their diameters, widths, forming methods and materials.