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Shimano Alfine 8 Speed Internal Gear Hub (IGH) http://www.fastbikeparts.ch/6_shimano-ersatzteile

von Bicycling

The Mechanical Magic of Internally Geared Hubs

How Internally Geared Hubs Work

The HUB GEAR is a mechanical transmission, which is installed in the rear wheel hub. Thereby, planetary transmissions are used. In this way, shifting systems from 2 to 14 gears can be realized.