Had the 10 speed version on my gen 1 Speed Concept. Ran them with Force derailleurs, red cassette and multiple front chainring combos including a 55 tooth rotor Q ring and 39 tooth round inner with no issues. My gen 2 Speed Concept has the 11 Speed versions, SRAM Red Yaw, kmc gold chain with 56x44 round rings. I haven't properly ridden it yet but in the few tests it works just great. Pic of the bike in the last page of the "Show us your ride" thread (it's the neon green sc)