The fc 9000 crankset may be used with the 7900 10spd drive train including di2 when paired with new cn 9000 chain bottom bracket not included available as a stages power equipped left armspecifications accuracy 2 weight only less than 20gr to base crank arm battery life 200 hours coin cell cr2032 power range watts 0 2500 cadence range rpm 20 1220 water resistance rating ipx7 frame compatibility most frames see fit guide in our support section cra