Shimano dh 3d37 front hubthis shimano dh 3d37 front hub is ideal for your city cruiser or touring bike not only will it provide dyno power to your front light its very durable and offers low rolling resistance its also compatible with centre lock brake rotors so if you have a more modern bike with disc brakes this is the dyno hub for you features material clear coated aluminium aluminium coil construction centre lock disc brake mount suitable for all dynamo operated 6v lighting systems