The Alfine 11 speed Di 2
Specification internal gear hub runs on needle bearings for increased durability & high drive efficiency. Helical internal sprockets increase durability, perform better with high torque loading & provide a constant engagement for a smooth & quiet operation. Oil bath lubrication system increases durability & reduces friction in the hub, while Labyrinth seals improve sealing performance both resulting in extending service life. Double roller silent clutch engagement also gives a smoother quieter shift. Top normal internal structure for enhanced tolerance when shifting while riding under load. Alfine hubs use pedal power to aid down-shifting resulting in fast & accurate shifts with an exceptionally light feel. Shimano's precise manufacturing abilities have enabled them to construct the Alfine internal hub to be there most efficient yet.