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