Old 07-27-19, 01:36 PM
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Trying random adjustments or parts swapping is inefficient. I would suggest removing the shift wire from the derailleur and checking, while applying tension by hand, to be certain that the shifter actually pays out and pulls in the wire when commanded. Then check to be certain that the derailleur cam be moved by hand while turning the crank; watch your fingers. Then adjust the derailleur in accordance with this procedure, not skipping any steps: https://www.parktool.com/blog/repair...eur-adjustment
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