The Shimano Alfine DH-S501 is a premium front dynamo hub designed for touring, commuting, and city riding where reliable, generator-powered lighting is essential. Producing a steady 6V/3W output, it delivers consistent power to front and rear lights even at low speeds, eliminating the need for batteries entirely.

Highlights

• 6V / 3W dynamo output: Provides reliable power for modern LED lighting systems, keeping you visible day and night without batteries.
• Centre-Lock disc brake compatible: Shimano's Centre-Lock rotor interface gives precise, easy rotor installation with excellent braking rigidity.
• Quick-release axle (QR x 100mm): Fits standard 100mm front dropout spacing for broad fork compatibility.
• 32-hole lacing: Works with a wide range of rim spoke counts for custom wheel builds suited to touring or city use.
• Aluminium shell: Lightweight yet durable construction keeps overall wheel weight down.
• Contact-type seals: Protect internals from water and grit, extending service life in all-weather riding conditions.
• E2 connector standard: Meets current European two-light wiring standards for straightforward light system integration.

Built for Reliable Everyday Power

Unlike bottle dynamos, the DH-S501's hub-mounted design runs silently and maintains consistent contact regardless of weather or tyre type. Power is generated as soon as the wheel turns, so there's no switching on or off — your lights are always ready when you are. Minimum efficiency of 30% ensures enough output to run front and rear lights simultaneously with compatible 6V systems.

Compatibility & Fit

Axle: QR x 100mm (9mm quick-release, 100mm over-locknut dimension). Spoke holes: 32H, 2.0mm diameter. Brake interface: Centre-Lock disc (rotor sold separately). Wheel size compatibility: 26" to 28" (646–716mm outer tyre diameter). Flange diameter: 70mm left and right. Connector type: E2 (two-light standard). Colour: Black.