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Shimano GRX Power Meters

Shimano GRX Power Meters Overview

You have a few great options for your Shimano GRX crankset based on your budget and if you are comfortable changing out your crankset. Both 4iiii and Stages make a Shimano GRX RX810 left crank arm power meter. With this type of power meter, you swap out your current left crank arm for the new power-equipped version. 4iiii also makes a right side crank arm as well. These Shimano GRX crank arm power meters are the most affordable options.

power2max makes spider-based cranksets for GRX. These power meters cost a bit more, however, the power2max measures power from both legs. In addition, their 24MM version is a direct replacement for your Shimano GRX so it makes changing your crankset easy.

Additional Information

Left Crank Arm Power Meter

Both 4iiii and Stages make a Shimano GRX RX810 power meter which is compatible with all Shimano GRX cranksets including GRX RX600. With this type of power meter, you swap out your current left crank arm for the new power-equipped version. These power meters are affordable and easy to install. The trade-off is they only measure left leg power.

Please note, whenever you are installing a left side power meter crank arm, you need to confirm you have 10mm of clearance between the left crank arm and the chainstay in order for the sensor to clear. Please see the image below.

Image showing the clearance between the frame and left side power meter crank arm

Pros: Affordable, easy to install, don’t have to change crankset
Cons: Measures left leg power only

Right Crank Arm Power Meter

4iiii also makes a right side version of their Shimano GRX RX810 power meter. This option is great for those that have a 4iiii GRX left side crank arm power meter and want to upgrade to a dual-sided crankset. With power sensors on both the left and right crank arms, you can measure power from both legs. Or, some bike frames cannot fit a left side power meter due to clearance issues with the chainstay. In these situations, the 4iiii right side power meter is a perfect solution.

Pros: Affordable, easy to install, don’t have to change crankset
Cons: Measures right leg power only

Spider-Based Power Meter

The power2max NGeco ROTOR ALDHU 24MM Crankset costs a bit more than the options above, however it’s a complete crankset and measures power from both legs. In addition, it is a direct replacement for your Shimano GRX crankset as it uses the same 24MM spindle. Therefore, this power meter fits your current bottom bracket without any changes. This makes installation very easy. Even better, the power meter gives you a narrow road Q factor vs. the slightly wider Q factor inherent in GRX cranks and allows you to run a 1x or 2x chainring set-up.

Pros: Moderately priced, VERY reliable, measures both legs
Cons: None

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