Shimano Nexus Alfine 8 speed How it works
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ShimanoIGHinternal gearepicyclic gearplanetary gearnexusAlfinebicyclecity biketransmissionbike lanecommuter bicyclegear shiftingbicycle repairbicycle wheel buildinggearhubSturmey ArcherDan BurkhartWaterfront Wheelshop2wagondragoncargo bikeTorontobike trailbike pathbicycle mechanicbicycle gearshow it workshow stuff worksrecreation8 speedeight speed3 speedthree speedmechanism