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 dura ace 6800 crank those riders looking for a complete crank set solution we offer the same non drive stages power meter mated to either a fc6800 standard 3953 tooth mid compact 3652t and compact 3450 tooth drive side crank bottom bracket not included specifications accuracy