Automobile tire bearings because most of the wheel bearings used in small passenger cars currently use sealed double-row angular contact bearings.These bearings are filled with grease to ensure the life-time lubrication requirements of the bearing.The grease is sealed inside the bearing by the oil seal .

This type of automobile hub bearing directly replaces the assembly if it is damaged during driving, and basically does not require any maintenance halfway, so it can be said that this wheel bearing is maintenance-free.

Automotive wheel bearings have now developed to the third generation: the first generation is composed of double row angular contact bearings. The second generation has a flange for fixing the bearing on the outer raceway, which can simply fix the bearing sleeve on the axle with a nut. Makes car maintenance easier. The third-generation hub bearing unit adopts the bearing unit and the anti-lock brake system ABS.