Shimano FH-RS470 Rear 12 x 142mm Centerlock Disc Brake Hub, 11-Speed HG Freehub - The Shimano FH-RS470 rear disc brake freehub features a Center Lock design, Internal Grease Sleeve, and Cup and Cone Bearing technology.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 durabilityHub features internal o-rings and a grease sleeve that helps maintain grease levels and increases service lifeThe Center Lock system makes an easy rotor installation possible with spline mount and a lock ring