This and whichever narrow wide for 1x. Although @amey reckons 6800 arms and a wolftooth NW is the lightest 1x crank setup (i think)
9000 and wolftooth would be lightest for silly money which then gets compensated as you have to use the XTRdi2 boat anchor rear mech
You don't have to have matching groupsets you know
@amey started
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This and whichever narrow wide for 1x. Although @amey reckons 6800 arms and a wolftooth NW is the lightest 1x crank setup (i think)