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...of the stuff I have redone for my own use, probably 70% of them need some sort of either minor or major realignment. As stated above, it's pretty common.
I routinely check the dropout spacing and alignment, frame alignment, fork alignment, and derailleur hanger alignment as part of the process on every bike I work on.
If a bike gets used, **** happens. And some of them were not well aligned when sold new, anyway.
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