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is grx ST-RX810-R rear shifter compatible with xt rear derailleur, Shimano XT M8000 Shadow+ Rear Derailleur - 11 Speed - Medium Cage GS

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No, Shimano 11 mountain and road cable pull are different. If you want bigger than the 42t that GRX rear derailleurs can do, you're going to either be dropping down a road derailleur with one of the hanger extensions, or using an adapter to a mountain derailleur.

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  • Speaking of the adaptors (Shimano road shifters to MTB rear derailleurs), I've had good luck with couple of them. I'm not a particularly skillful mechanic & I had them setup and shifting well with reasonable effort.
    – Paul H
    Sep 17 at 17:08
  • You could also use a friction shifter. Maybe not ideal for 11 speed but it works fine on my 9x.
    – Ola
    Sep 17 at 18:51

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