As the name suggests, this excellent device is the most precise way to keep on top of your riding outputs. This left-arm model is compatible with Shimano Dura-Ace FC-R9100 cranksets, delivering real-time cadence and power data straight to your onboard computer or smartphone via ANT+ and Bluetooth. Weighing only 8g, it gives output readings to within +/-1% accuracy, letting you make the appropriate adjustments in an instant.
IPX7 waterproof rated and equipped with 100+ hours of battery life, the 4iiii Dura-Ace Power Meter is an excellent way to keep yourself riding at your very best.
Please note: Crankarm only, no accessories included.









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