Bicycles Asked on September 29, 2020
It seems that is the case with my rear QR/derailleur. If QR is really tight it’s impossible to get the shifting quite right. Could it be because of material fatigue in my derailleur hanger? It’s been straightened twice. I’m curious if anyone experienced same symptoms.
Yes, this can happen as a result of variance in how hard the QR is tightened causing variance in the alignment of a replaceable rear derailleur hanger. Typically this relates to lack of precision in the manufacture of the hanger and/or dropout and consequent poor fit of their interface. Sometimes by taking the hanger off and studying the interface you might observe spots of paint or material to remove that are clearly making the interface not lay flat. Other times one of the surfaces isn't flat.
Here's what I would typically do:
Fatigue from repeat alignments is its own concern but will not itself cause this problem. I can imagine a replaceable hanger getting bent in a way where the mating surfaces weren't flat anymore after aligment, and this problem resulted. I've also seen brand new bikes do this.
Correct answer by Nathan Knutson on September 29, 2020
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