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4iiii PRECISION Shimano GRX RX810 Right Side Power Meter

Josh Matthew February 25, 2024
5.00 out of 5 based on 1 customer rating
(1 customer review)


4iiii power on a Shimano GRX RX810 right side crank arm!

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4iiii PRECISION Shimano GRX RX810 Right Side Power Meter

The 4iiii PRECISION Shimano GRX RX810 Right Side Power Meter is perfect for those that have a 4iiii Shimano 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 and record 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, this 4iiii right side power meter is a perfect solution. It allows you to quickly and easily add power to the right side of your crankset where clearance and compatibility issues don’t exist.

The 4iiii GRX RX810 Right Side Power Meter uses patent pending 3-D tri-axial strain gauge technology, which is accurate +/- 1.0%. It’s also super lightweight (added weight of about 10 grams) and comes with a full 3-year warranty. 4iiii power meters are compatible with both ANT+ and Bluetooth SMART devices. This means you can use it with your favorite bicycle computer, watch or smart phone.


Key Product Details


This power meter is compatible with Shimano GRX RX810 and RX600 cranksets. See Compatibility tab for more information.

Power Measurement:

This 4iiii power meter measures right leg power and doubles the value to account for both legs (assumes both legs are generating the same force).

Key Features:

Accurate to within +/- 1.0%, lightweight at only 10 grams of added weight, 100 hours of battery life, CR2032 user-replaceable battery, ANT+ and Bluetooth compatible, easy to install, 3-year warranty. See Specs tab for more information.


Options For This Power Meter

Crank arm lengths: 170 mm | 172.5 mm | 175 mm

Chainring size: 40T | 42T | 48/31T


Other Versions to Consider

Dual-Sided GRX RX810 Crankset: We also sell the 4iiii PRECISION PRO Shimano GRX RX810 Dual-Sided Power Meter which is a complete crankset. It is more expensive, however it measures power from both legs.


The 4iiii power meter is compatible with all Shimano GRX cranksets including GRX RX600.

4iiii PRECISION Shimano GRX RX810 Right Side Specs

Name4iiii PRECISION 2 GRX Right Side
Bike TypeGravel
Location of Power MeasurementCrank Arm
Left or Both Legs MeasuredRight only
Independent Left/Right MeasurementNo
Crank Arm MaterialAluminum
Communication ProtocolANT+ and Bluetooth SMART
Claimed Accuracy+/- 1.0%
Automatic Temp. CompensationYes
Weight10 grams (sensor) | 472 grams (170 mm, 42T) | 520 grams (170 mm, 48/31T)
Battery TypeCR2032 coin cell
Battery Life100 hours
Method of Cadence MeasurementAccelerometer
Warranty3 years

In the Box

  • 4iiii Power Meter with chainring
  • CR2032 coin cell battery

Tools Needed for Installation

You will need the following tools for installation of this product. You can purchase many of these commonly used tools in our store.

  • Shimano Crank Arm Cap Tool
  • 5 mm Allen key

Common Questions and Answers

Question: Does this power meter come with a left crank arm too?

  • No, this power meter is a 4iiii right side crank arm only. Assuming you currently have a Shimano GRX crankset on your bike, you swap out your right side crank arm for this power equipped version, and you keep your current left side crank arm on the bike.

Question: How do I determine what length my current cranks are so I can make sure I get the same size?

  • Your crank arm length should be printed or stamped on the inside of the left crank arm, usually near the pedal end.

End of crank arm showing crank arm length

Question: Do you also stock new chainrings for my Shimano GRX crankset?

1 review for 4iiii PRECISION Shimano GRX RX810 Right Side Power Meter
  1. Kim Hyunseung (verified owner)

    Shipping was bit slow, but I would give it 5 stars for their friendly response.
    It works well with my exisitng grx left sided PM. Thanks to PMC

    • Power Meter City

      Thank you Kim! We are glad you finally received your power meter! Thank you for taking the time to leave us an awesome review! (Our very first one!) If there is anything else we can do, please let us know! Ride safe!

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