11 Comments

  1. Upper limit screw likely. Park Tool has some great YouTube guides on setting up your shift indexing.

  2. All these comments could be right, but most likely it’s a combination of everything and additionally you might have a bent derailleur hanger. Bring it to a shop, diagnosing what the actual issue is yourself can be extremely tedious if it’s your first time without help.

  3. adultagainstmywill on

    Another vote for derailleur hanger. It’s a sacrificial part that bends whenever the derailleur takes a hit.

    Cheap to replace, or your local bike shop has hanger straightener tools.

  4. GunTotinVeganCyclist on

    Besides the indexing, limit screws, derailleur hanger alignment and loose quick release already mentioned, that shift cable needs replacing.

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