CE Smith Bearing Protector 2.441" With Cover, Pair. The change from warm air to cool water during launch can create a vacuum in the hub, pulling in water and road grit. This contaminates the grease causing corrosion and rapid wear. Bearing protectors fill the entire hub with grease, expels most air and adds pressure to the hub, protecting it from water and grit. An automatic pressure relief feature prevents over-filling the hub which would damage seals. Chrome plated. Fits hubs with an inner diameter of 2.441".