Shimanos SG-8R36 premium 8 speed hub is light weight & runs on needle bearings for smooth operating internal mechanics Superior weatherproof functionality with labyrinth seals Inter-8 hubs use pedal power to aid down-shifting resulting in fast & accurate shifts with an exceptionally light feel Shimanos precise manufacturing abilities construct Inter-8 rear hubs with significantly less drag than previous models in combination with quick smooth silent shifting Nexus roller brake compatible 132 mm O.L.D.fitting kit sprocket & shifter sold separately