Shimano Metrea DH-UR700-3D Dynamo Front Hub Generate Power Lights need power to run. With a Dynamo hub, you can easily power your compatible lights. The Shimano Metrea DH-UR700-3D/DH-UR705-3D Dynamo front hub employs an internal unit construction that is lightweight and reduces drag while producing 3 Watts. It is designed for 26 - 28" quick-release wheels. Features Employs an internal unit construction that is lightweight and reduces drag Produces 3 Watts to power your compatible lights Designed for 26" to 28" quick-release wheels SPECIFICATIONSHub Size QR x 100mm Spoke Interface J-Bend Hub Drilling32HBrake Type Center Lock | Shimano | Metrea Dh-Ur700-3D Dynamo Front Hub Qr X 100Mm Center-Lock | Black | 32H