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  1. That is a derailleur hanger – specific to the frame. Undo the 6mm bolt closest to your right hand, reattach the hanger to the frame and new rd will bolt right on. If the hanger is damaged wheels manufacturing or betd will probably be able to help you with a new one if the frame manufacturer cant.

  2. Blakeyardigan93 on

    Tell us what frame/year your bike is and we can help narrow it down. Also your derailleur might be fine but that hanger is definitely dead. Unless you can see the cage if your derailleur is bent pretty bad

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