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What, if anything, do I need to make an 11sp Shimano MTB cassette play nice with a DA 7900 freehub?
Nothing. An 11spd MTB cassette has the same width as a 9sp road cassette. You don't need any spacers on an 8/9/10 speed freehub, you'll need a 1.8mm spacer on an 11 speed road freehub. According to the Shimano compatibility chart.
Brommers
What, if anything, do I need to make an 11sp Shimano MTB cassette play nice with a DA 7900 freehub? I believe these are '10sp only' but does MTB 11s = MTB 10s = Road 10s with Shimano cassette widths? I've got a funny feeling it's spacers, but less than the 1.85mm one...