5 Comments

  1. Not enough of the bike is in the video.  Could be a billion things

    Chain too short?
    Deraileur maladjusted various ways

  2. I’ve done this when installing a chain, plus I’ve had it done at a shop (and sent a photo to the shop but don’t recall the result). I took off the bottom sprocket, fixed the issue and put the sprocket back with the chain looped over it. I moved the derailleur to the smallest cog for a looser chain to make this easier. Good luck!

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