• You need to adjust the limit screws on your rear derailleur. YouTube is your friend here.

    Spacer is not required.

  • The limit screws are adjusted correctly—the chain catches between the sprocket and chainstay with the current 12t sprocket on there. This wasn't a problem when I had an 11t sprocket on there.

  • A spacer on the DS is possible, but it would mess up the dishing of your wheel. Worth checking if there's a spacer between the cassette and hub.

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