Shimano Alfine SG-S7001-11 Carrier 2 Unit Description: The Shimano Alfine SG-S7001-11 Carrier 2 Unit consists of planetary gears and supporting hardware within the carrier which help to change the gears inside of an Alfine 11-speed internally geared rear hub. This is a factory replacement part to help to replace worn or damaged parts to restore optimal shifting performance of the internally geared rear hub. Features: Includes planetary gears, outer casing, and other hardware that completes the carrier 2 unit Hub axle unit, sun gears, bearings, and other components of the internal assembly sold separately