Derailleur_gears

 by Ralf Roletschek - Own work. Licensed under GFDL 1.2 via Commons - https://commons.wikimedia.org/wiki/File:14-06-20-shimano-600-RalfR-N3S_7903-05.jpg#/media/File:14-06-20-shimano-600-RalfR-N3S_7903-05.jpg

Derailleur gears


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