Shimano Alfine 8-speed Internally Geared HubsShimano"s highest efficiency internally geared hubSilent double roller clutch engagement for smooth, quiet shiftingCenter lock disc brake rotor compatiblePiano black finishDoes not include shifter, rotor, cog, cog snap-ring, axle nuts, non-tun washers & cassette jointAlfine cogs include attached chain guardCompatible with Nexus cogs42mm chainlineShimano"s highest efficiency internally geared hubDouble roller clutch engagement for smooth, quiet shiftingCenter lock disc brake rotor compatiblePiano black finishDoes not include shifter, rotor, cog, cog snap-ring, axle nuts, non-tun washers & cassette jointAlfine cogs include attached chain guardCompatible with Nexus cogsItem SpecificationsColorBlackWeight1680gIntended UseRoadHub Drilling36spokesRear Axle Type3/8" bolt onCassette Body TypeSingle Cog DriverHub/Brake CompatibilityCenter-Lock DiscRear Hub Spacing135mmSkewer IncludedNA, Bolt-OnChainline42