SHIMANO DH-S501 Alfine Dynamo Disc Hub Alfine Dynamo front hub with an ultra-efficient and virtually drag-free 3.0 watt power supply for use with LP-R600 handlebar mounted light kit Quick-release axle for standard 100mm-OL dropouts CenterLock disc brake compatibility (can also be used with rim brakes) Includes: DH-S501 dynamo hub with E2-type power connector and quick-release skewer (dynamo light/wiring kit and/or brake sold separately) Shimano Reference Number: DH-S501