4iiii Innovations Precision 3+ Pro Ultegra R8100 power meter crankset

This 4iiii Innovations Precision 3+ PRO Ultegra R8100 crankset with power meter measures the power of the right and left legs. It’s designed for riders who train with power on a road bike with a Shimano 2x12 drivetrain.

• See the power output of each leg, thanks to sensors on both crank arms
• Reliable data: stated accuracy of +/- 1.0% and active temperature compensation
• Connects to bike computers and apps via ANT+ and Bluetooth SMART
• For 2x12 road bikes with a 24 mm Shimano bottom bracket
• Choose 50-34D or 52-36D chainrings and 165, 170, 172.5, or 175 mm crank arms

Technical specifications

• Weight: 736 g with 170 mm crank arms and 50-34 chainrings
• Accuracy: stated +/- 1.0%
• Connectivity: ANT+ and Bluetooth SMART
• Battery: CR2032, rated for 550 hours
• Crank arm material: Aluminum
• BCD: 110 mm, asymmetric 4-bolt
• Axle diameter: 24 mm
• Q-factor: 148 mm
• Crank arm lengths: 165, 170, 172.5, 175 mm
• Chainrings: 50-34D, 52-36D