Clark W. Griswold
Join Date: Mar 2014
Location: ,location, location
Posts: 14,619
Bikes: Foundry Chilkoot Ti W/Ultegra Di2, Salsa Timberjack Ti, Cinelli Mash Work RandoCross Fun Time Machine, 1x9 XT Parts Hybrid, Co-Motion Cascadia, Specialized Langster, Phil Wood Apple VeloXS Frame (w/DA 7400), R+M Supercharger2 Rohloff, Habanero Ti 26
Usually it is poor routing of a chain through a rear derailleur I will sometimes just do it mindlessly and then realize oops wrong way. It doesn't happen super often but every once and while.