Shimano SG-S7051 Alfine Di2 Internal 8 Speed Hub Gear

The Alfine 8-speed Di2 specification internal gear hub runs on needle bearings for increased durability and high drive efficiency

Key Features:

• Top normal internal structure for improved tolerance when shifting while riding under load
• Labyrinth seals improve sealing performance extending service life
• Alfine hubs use pedal power to aid down-shifting resulting in fast and 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
• Centre-Lock disc rotor compatible
• 135 mm O.L.D. spacing