Offering the precision and functionality needed for scientific training, the Shimano Ultegra FC-R8100 Power Meter Crank Arm Set provides dual-sided measurement that is accurate within 1.5%. Its long battery life, easy recharge, and ANT+ and Bluetooth LE connectivity makes using and recording your workouts easier than ever.

FEATURES:

• Integrated, waterproof, and rechargeable Li-ion battery
• Up to 300+ hours of ride time (depending on ANT+/Bluetooth LE settings)
• Accurate data collection
• 1.5% strain gage accuracy throughout the entire calibration range (depending on ANT+/Bluetooth LE settings)
• Proprietary strain gauge
• Quick and easy start-up process