4iiii PRECISION Power Meter – Shimano 105 5800 | Black – Aluminium – 170mm

The 4iiii Precision Power Meter for Shimano 105 5800 cranks is a pre-installed power meter on a Shimano 105 left hand crank arm. This allows you to simply replace your left-hand crank arm and you're ready to ride. Precision is the world’s lightest left side power meter, designed provide you with industry leading power accuracy with highly dependable cadence data, a light weight design, broad ANT+ and Bluetooth smart head unit compatibility and 3D power meter technology capable of measuring tri-axial strain on your crank.... More