Wheel Hub Bearings
Wheel hub bearings allow the wheel and tire assembly to turn freely around the spindle, in the steering knuckle, or in the bearing support. The hub and rotor assembly includes an inner and an outer set of bearings, generally double-row angular contact ball bearings or tapered roller bearings. There are differences in the assembly of the driver and the non-driver wheel hub. Flanged bearings, which are bolted to the brake rotor, wheel and knuckle, are used in the non-driver hub. Where plain or bearings with integral flanges can be used in the driver wheel hub. Wheel bearings are lubricated with heavy, high-temperature grease, allowing the operation with very little friction and wear.