SHIMANO Shimano DH-S501 Alfine, 6v 3w, Centre-Lock disc, 36h, Q/R, silver

. Alfine 6 volt 3 watt dynamo front hub with easy to use Centre-Lock disc brake mount. Provides bright illumination for safer night riding without the need and expense of replacing batteries. Important weight savings are made by using an efficient and light weight aluminium coil structure. Disc brake compatible, with Centre-Lock rotor mount. Labyrinth and contact sealing - low-friction seals effectively shut out water, mud, and dirt without affecting rotational smoothness increasing service life. Borozon treated bearing races - super mirror finish bearing races reduce friction and provide a more precise bearing action. Push-in wiring harnesses make installation fast and easy. Anodised forged aluminium hub shell. Comes with an easy to use quick release skewer.