Crank Arm Power Meters for Road

Additional Crank Arm Power Meters for Road Info:

Brands

We carry crank arm power meters from 4iiii Innovations, INPEAK, SRAM, and Stages Cycling. These units replace the non-drive side crank arm on your SRAM or Shimano crankset.

Check Frame Compatibility

Before purchasing a 4iiii, INPEAK or Stages power meter, you should confirm compatibility with your frame. On some bikes, there is not enough room between the non-drive side crank arm and the chainstay. This is necessary for the sensor to clear the frame. Therefore, you should make sure you have at least 10 mm of clearance for Stages power meters and 8 mm of clearance for 4iiii PRECISION 3+ and INPEAK power meters. Also, make sure that you don’t have a bottom bracket mounted rear brake (used on some aero and TT bikes). Please refer to the image below.

Quick Product Comparison:

Price

4iiii and Stages power meter crank arms are priced very similarly. Because they make power meters for similar cranksets, their pricing is very close. INPEAK also offers power meter crank arms for Shimano cranksets, but they are slightly more expensive than 4iiii and Stages. The main difference INPEAK offers is a rechargeable power meter option. 4iiii and Stages power meters are both only offered with coin cell batteries. SRAM pricing depends on the model of crank arm you are replacing.

Models

4iiii, INPEAK and Stages offer power meter crank arms for Shimano cranksets. 4iiii also offers Factory Install options for Cannondale, FSA and SRAM crank arms.

In addition, all companies make left crank arms (which are 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 Cranksets page.

SRAM offers power meter upgrades for their Force, Rival and Apex cranksets.

Installation

All these power meters install the same way. You simply remove your current, left-side crank arm power meter and replace it with your new, power-equipped version. Installation typically takes about 5-10 minutes for most models.

The one exception to this is the Stages Carbon for SRAM BB30 Power Meter, which also requires that you replace the spindle. Note that for Shimano models, you will also need a Shimano Crankarm Cap Tool (sold by us separately).

Power Measurement

All these left side crank arm road power meters measure power from the left leg and double the value in order to determine total power. This method of power calculation assumes that both legs are producing the same power.

ANT+/Bluetooth SMART

All of these power meters are dual ANT+ and Bluetooth SMART compatible.

Batteries

4iiii and Stages power meters use CR2032 batteries. INPEAK has the POWERCRANK which uses a CR2032 battery and the POWERCRANK-E which is rechargeable. 4iiii PRECISION 3+ models offer 800 hours of battery life while Stages and INPEAK POWERCRANK models get about 200 hours. The POWERCRANK-E offers 90 hours of battery life. SRAM power meter crank arms use a replaceable AAA battery that provides 400+ hours of battery life.

Weight

Crank arm power meters for road bikes 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. INPEAK adds about 10 grams while Stages adds about 15 grams, which is still very light. SRAM power meter crank arms add about 40 grams.