Dudes, I gotta say My XX1 group is amazing. It is not perfect, but after 6 month and 10 races it is a game changer and i can't imagine going back to a front derailleur. The range (for me) is perfect. The XX1 cassette is about the same weight as XTR 10 sp. This pic looks to be an XX1 cassette. Why wait to release 2 groups a year later than release them as they design them? The X9 cranks are hollow, and have the same splined spider mount as XO/XX1. It looks like they chose a 104mm BCD, that...