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@Dammit
I have an XX1 10-50 cassette on the Scalpel, with an XTR GS mech - which is meant to be for a maximum of 45 teeth on the largest sprocket. Shimano XTR cassettes are 10-51, and require the SGS mech. Therefore, my mech is five teeth over its rated capacity, and maybe I should have bought the SGS which would be one under its max.
Has anyone else run this combination and made it work perfectly? I've got minor shifting gripes in the middle of the block which I'd like to vanquish.