4iiii Precision Left-Only Power Meter + Shimano Dura-Ace R9100 Crank Arm

Whether you’re a pro or simply training hard, PRECISION powermeters deliver industry-leading accuracy, highly dependable cadence data, 3D powermeter technology capable of measuring tri-axial strain on your crank arm. Designed to be durable and lightweight, compatible with ANT+ and Bluetooth head units, PRECISION helps you train harder and smarter.

PRECISION Ride Ready comes installed on a new Shimano left crank arm (Ultegra or Dura-Ace). These crank arms will fit bottom brackets using the Hollowtech II interface.

Data accuracy: +/- 1% error margin
Battery life: 100+ riding hours on 2032 coin cell battery
3D powermeter technology (patent pending) measures tri-axial strain on your crank arm
Lightweight, compact design
Battery status indicator via 4iiii app
Compatible with ANT+, Bluetooth Smart head units, smartphones, and other 4iiii products
User-friendly app and configurable rider compensation scale factor
Easy setup and maintenance

Mfr Claimed Weight
9g (power meter only)

NOTE: Check your frame clearance before ordering by downloading and printing the compatibility guide