Wheel bearings typically fail from water and dirt contamination. The All Balls wheel bearing was developed in partnership with KML Bearing and is designed for the difficult operating environment of the Powersport industry. Kit contains ball bearings and seals - all that is required to re-fit a single wheel. Premium EMQ quality high-speed bearing featuring low drag double-lip rubber seals which provide superior exclusion of water and dirt and improved grease retention. Type TC nitrile elastomer wheel seals are specifically designed to keep out water and dirt. Rubber-coated outside diameter creates an optimum seal at hub. Steel garter spring guarantees constant pressure on the axle shaft over the life of the seal. Bearings utilize Chevron SR1-2 grease which contains high-performance rust and oxidation inhibitors (-29C to 177C). Fits: Yamaha YZF R1 2015-2021 YZF R1M 2015-2021 YZF-R1M 2023 YZF-R7 2023