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  1. It goes on the frame when using a front derailleur for better leverage against one of the adjustment screws. 

  2. HolmesMycroft9172 on

    It’s the plate that sits behind your front derailleur and prevents your frame from taking the full brunt of the opposing forces necessary to swing the derailleur and the chain up to the big ring. Not every frame needs it. Iirc I had one left over from my SRAM force axs 2 x gravel chain set setup with the Niner MCR.

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