DMR Revolver Rear Disc Hub 36h 8/9spd, Blk Forged AL-6061 shell and AL-7075-T6 axles with Allen quick-release bolts Double lip-sealed cartridge bearing to keep out water and crud 3 heavy-duty engagement pawls and is spaced for 135mm DMR's Revolver hubs are lightweight and an excellent value. The replaceable freehub body readily accomodates 8- or 9-spd cassettes.