Shimano Alfine S501 Dynamo Hub
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Details
A solid choice for a relatively low-cost, reliable dynamo. Works well with your touring or commuting bike. It can also power many smart devices and GPS units via a handlebar-mounted USB port, in conjunction with either a Busch & Mueller Luxos U front light, Supernova's The Plug power converter, or the Sinewave Cycles Reactor power converter.
Quick-release axle for standard 100mm-OL dropouts.
For bikes with centerLock disc brakes (can also be used with rim brakes).