4iiii Innovations Precision 3+ Ultegra R8100 Left Crank Power Meter

The 4iiii Innovations Precision 3+ Ultegra R8100 left crank arm is a single-sided power meter. It’s right for you if you want to train with power on a bike with a Shimano Hollowtech II crankset.

• Measures power on the left crank arm, accuracy ±1%
• Connects to bike computers and apps via ANT+ and Bluetooth
• CR2032 battery included, lasts up to 800 hours
• Water-resistant, IPX7 rated
• Choose your length: 165 mm, 170 mm, 172.5 mm or 175 mm

Technical specifications

• Version: Left crank arm, single-sided measurement
• Weight: 9 g
• Crank arm lengths: 165 mm, 170 mm, 172.5 mm, 175 mm
• Compatibility: Shimano Hollowtech II
• Connectivity: ANT+ and Bluetooth
• Battery: CR2032, up to 800 hours
• Accuracy: ±1%
• Protection: IPX7
• What's included: Crank arm with power meter and one CR2032 battery