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@hippy
I've got an XT RD on an 11s 11-42T cassette on the Surly.
I've got a similar XT RD but 10S on the Tarmac but I've only run 11-36 on that though I do have a Wolf Tooth to try and push it to 10s 11-42T
I've run a lot of Di2 based 11s 11-36, 11-40, 11-42T combos on my ultra bikes.
Before going to Di2 my missus had mechanical 105 long-cage RD with a Sunrace 11-42T cassette
Long cage RD, maybe with a Wolf Tooth will often get you to 42T