Senior Member
Join Date: Aug 2010
Location: Madison, WI
Posts: 11,299
Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
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I have not damaged a rear derailleur on a bike, but I did buy a used rear XT at a bike swap that I did not realize was damaged. Put it on a bike for a long ride. Shifting was not quite right. Figured out that someone had bent the cage. With a big vice and some other big tools, got it aligned right. But it was pretty clear that someone must have hit something pretty hard to do that.