Shimano Nexus DH-UR705-3D Dynamo Hub - 6v 3w - for Center Lock Disc -

Highly efficient, super light weight, premium grade 6 volt 3 watt dynamo front hub for easy to use and ridged 12 mm axle fitment 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 For use with rim brakes Labyrinth and contact sealing as used on the premium groupsets - low-friction seals and internal grease sleeve effectively shut out water, mud, and dirt without affecting rotational smoothness increasing service life Borozon treated cup and cone bearing races - super mirror finish bearing races reduce friction providing smooth and precise bearing rotation Push-in wiring harnesses make installation fast and easy Double anodized, premium finish forged aluminium hub shell 12 mm x 100 mm O.L.D. SM-AX720 axle sold separately Average weight 550 grams