Shimano XT M8120 Gen 3 R Power Meter Crank Arm

Power meters give you the advantage in training, and that's what you want when you're working up to a big race. With the Shimano XT M8120 Gen 3 R Power Meter Crank Arm, you'll be ahead of the game with consistent measurements and data that allows you to keep on improving. This power meter adds a mere 15 grams to the weight of the crank arm, and it's compatible with both ANT+ and Bluetooth SMART devices. It is compatible with all Shimano Hollowtech II MTB cranksets.