Cartridge bearings with weather resistant seals are used on most of our hubs. Race hubs are designed with Cyclocross in mind and have improved, double bearing seals for even more protection against the elements. Sealed does not mean waterproof. If your bearings are submerged in water or subject to a pressure washer or invasive cleaning, you should have them serviced or replaced by a professional mechanic. Our bearing preloads are set from the factory; there is no need to adjust them. All of our sealed cartridge bearing hubs include an internal cam quick release.