The ultegra 6800 stages power meter fits all styles of 6800 crankset including compact and standard riders looking to add power to their existing crank need only to match the crank length of their existing ultegra 6800 crank specifications accuracy 2 weight only adds 20gr to base crank arm battery life 200 hours coin cell cr2032 power range watts 0 to 2500 cadence range rpm 20 220 frame compatibility most frames see fit guide in our support section crank