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 XT M8100 left crank arm . These crank arms will fit bottom brackets using the Hollowtech II interface. Note: Check your frame clearance before ordering by downloading and printing the compatibility guide from 4iiii Features: 3D powermeter technology (patent pending) measures tri-axial strain on your crank arm Accurate, consistent data 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 Specifications: Weight of powermeter: 9 grams Data accuracy: +/- 1% error margin Battery life: 100+ riding hours on 2032 coin cell battery