The shimano capreo 6v 30w quick release front hub for use with rim brakes 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 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 provi