Auto wheel bearing is the main purpose of bearing and to provide accurate guide to the rotation of the wheel hub, it is under axial load and radial load, is a very important component.It is developed on the basis of standarded angular contact ball bearings and tapered roller bearings. Greased and sealed for life, the first generation wheel bearing cuts installation time and virtually eliminates problems caused by improper seal handling and bearing clearances. It is often equipped with a seal, on one side of the bearing unit, including an integrated magnetised ABS impulse wheel.Auto bearings have taper roller bearings and angular contact ball bearings,single row and double row taper roller usually use in front wheel hub bearings.Car wheel bearings installed in the car wheel hub unit,it is aim to improve the wheel bearing performance,wheel bearings from the early two single row taper roller bearings developed to double row taper roller bearings and double row angular contact ball bearing