A derailleur hanger (or mech hanger) is not a part most people are aware of, but the sacrificial mount for the rear derailleur can cause shifting to go completely wrong if even a little bent out of alignment.
Follow our guide to see how to fix a derailleur hanger with or without a special alignment tool.
If you’re in the market for a tool, you can buy a LifeLine hanger alignment tool here for £45: https://fave.co/3hJkTwq
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