• Yes, GRX derailleurs work with 11-speed XT cassettes. Make sure you add a 1.85mm spacer if you are using an 11-speed road hub.

  • mmm, I think I forgot to do that with my RX812 + CS-M7000 on DT370. Should I panic, or just put it on and move on? I think a spacer was supplied with the turbo trainer...

  • I also forgot to do that and it made the cassette rattle around! Remove the cassette and check that the freehub body is not damaged. If it looks OK pop a spacer on and you are good to go.

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