R45D hubs combine low-drag 45-tooth RingDrive system, a lightweight hub body, and legendary made-in-house bearings. The result is the increased power and modulation of disc brakes, the fast, smooth rolling speed of our bearings, and the superior responsiveness of our RingDrive engagement system when you put the power down.Patented RingDrive system with 45 simultaneously engaged points of contact for virtually drag free engagementEasily serviceable and completely re-buildable with our R45 Hub Service ToolItem SpecificationsBearing TypeSealed CartridgeCassette Body TypeShimano HGCassette Body TypeShimano HG 11/12-Speed RoadColorBlackDefined ColorBlackHub Drilling24Hub/Brake CompatibilityCenter-Lock DiscRear Axle12mm Thru x 142mmSkewer IncludedNoSpoke InterfaceJ-Bend Chris King R45D Rear Hub Rear Hub UPC: 841529244656