Alfine disc & rim brake 8-speed internal hub gear wheel system brings high performance technology to a affordable price point The Alfine 8-speed internal gear hub runs on needle bearings for increased durability & high drive efficiency Alfine hubs use pedal power to aid down-shifting resulting in fast & accurate shifts with an exceptionally light feel Double roller clutch engagement also gives a smoother quieter shift Shimano's precise manufacturing abilities have enabled them to construct the Alfine internal hub to be their most efficient yet Easy to use Centre-Lock disc rotor mount for secure hassle free setup Machined braking surface for use with rim brakes & butted 2.3 / 1.8 / 2.3spokes Labyrinth seals improve sealing performance extending service life 700C rim compatible with 28-47C tyres 135 mm O.L.D.2330 grams