Excellent quality and durable 6 volt 3 watt dynamo front hub with low rolling resistance and easy to use quick release Provides bright illumination for safer night riding without the need and expense of replacing batteries For use with rim brakes Features contact seals to prevent the ingress of corrosion-causing water and muck without affecting rotational smoothness increasing service life High quality bearing races reduce friction and provide a more precise bearing action Push-in wiring harnesses make installation fast and easy Forged aluminium hub shell Comes with an easy to use quick release skewer