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 youre ready to ride. Available in Black or Silver with a choice of 170mm, 172.5mm or 175mm crank arm lengths.
This unit comes pre-installed on a Shimano 105 5800 (Black) left hand crank. Click here for The 4iiii Manual. Improved Battery Life Extend your battery life up 100 hours with the latest Firmware upgrade. Weve also made improvements that make allowance for general sensor vibration so you no longer have to remove your battery when transporting your bike. Battery Indicator Now you will be able to