Your derailleur hanger, the achilles heel of your bicycle
My touring bike has fallen over three time on the derailleur side, wasn't shifting well in certain gears. New chain, rings, and cassette... replaced the rear derailleur in the upgrade... what was wrong, it looked ok...., OK, took off the rear fender, rack, dropped the chain, cleaned up the hanger and installed the Park DAG 2.2 hanger adjustment gauge. the Hanger was off about 12^ in vertical plane, about 6^ in the horz plane. With the bike in my park stand, and a friend supporting the bike, I applied some force in the two planes, a little at a time. My alignment seems to be spot on...., and guess what, no more shifting problems.... Yes, it was worth it.
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