Wheel size is actually the diameter of the wheel, often heard people say 15-inch wheels, 16-inch wheels such as this statement, of which 15, 16 inches refers to the size of the wheel (diameter). Generally in the car, wheel size, tire flat ratio is high, in the visual can play a very good tension effect, and in the vehicle handling stability will also increase, but with the increase in fuel consumption such an additional problem.
Bearing (Bearing) is an important part of contemporary mechanical equipment. Its main function is to support the mechanical rotating body, reduce the coefficient of friction in the process of its movement, and ensure its rotary accuracy.