This page contains our crank arm power meters for road bikes. Along with pedals, crank arm-based power meters are one of the most popular power meter types. They are affordable and easy to install. In addition, you can find a crank arm power meter to fit virtually any crankset.
Brands: We carry crank-arm based power meters from 4iiii Innovations, Stages Cycling and Pioneer.
Options: All three of these companies make left crank arms (the power meters on this page), as well as complete cranksets that measure both left and right leg power. The complete cranksets can be found on our Dual-Sided Crank Arm page.
Important Notes: Before purchasing, you should confirm compatibly with your bike frame. The power sensor that is attached to the inside of crank arm needs approximately 10 mm of room to clear the chainstay as you rotate the cranks. See the image below.
Quick Product Comparison:
Price: While these companies make many different models, in general, the 4iiii power meters are priced below the others. The Pioneer units are usually the next most affordable, followed by Stages.
Installation: All of these power meters install the same way. You simply remove your current, left-side crank arm and replace it with your new, power-equipped version. Installation typically takes about 5-10 minutes for most models. Note that for Shimano models, you will also need a Shimano Hollowtech II crank arm cap tool (costs about $5.)
Power Measurement: All of these left side crank arm road power meters measure power from the left leg and double the value in order to calculate total power.
ANT+/Bluetooth SMART: All of these power meters are dual ANT+ and Bluetooth SMART compatible.
Batteries: All of these power meter run off of CR2032 batteries. Note that with the 4iiii, you also have the choice of a rechargeable battery with their Podium models.
Weight: Crank arm-based power meters are one of the lightest power meters you can buy. The 4iiii adds a mere 7.5-9 grams (based on the model) to your bike. The Stages adds 20 grams and the Pioneer adds 22 grams.