Thought Id share. X9 arms w/ GXP BB are 646 grams, exactly 80 grams more then their carbon XO brethren at 566 grams. Hope this is useful for those interested in a spiderless set up debating the two.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: X9 crank arms and GXP BB weight