Wheel bearings typically fail from water and dirt contamination. The All Balls Rear Wheel Bearing Upgrade Kit was developed in partnership with KML Bearing and is designed for the difficult operating environment of the powersport industry. Kit contains ball bearings, wheel spacer(s) and seals. Rubber sealed bearings for additional protection from water and dirt. Chevron SR1-2 grease - Hi-performance rust and oxidation inhibitors (-29°C to 177°C). Bearings - Precision high-speed bearings manufactured to ABEC3 standards. Double-lip seal - Type TC.