• 12s Di2 means ultegra and that's only a 32t on the back isn't it. Not a huge range. If you want GRX then it's 11s anyway.
    You probably want 2x but if not, 11s 1x you can use an XT RD with road shifters

  • I think 36 is the minimum I'd want on a gravel bike but if you use a sub compact double then 34 would probably be alright.

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