The Shimano FH-RS470 rear disc brake freehub features a Center Lock design, Internal Grease Sleeve, and Cup and Cone Bearing technology. Features: The Center Lock system makes an easy rotor installation possible with spline mount and a lock ring Hub features internal o-rings and a grease sleeve that helps maintain grease levels and increases service life Cup and Cone bearings offer greater strength than sealed cartridge industrial bearings due to their ability to displace lateral and vertical loads more effectively for super smooth rotation and longer durability Specs: ColorBlack Defined ColorBlack Spoke InterfaceJ-Bend Rear Axle12mm Thru x 142mm Hub Drilling32 Skewer IncludedNo Bearing TypeSealed Cartridge Hub/Brake CompatibilityCenter-Lock Disc Cassette Body TypeShimano/SRAM 11 Speed Road