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4iiii PRECISION PRO Shimano GRX RX810 Dual-Sided Power Meter

Josh Matthew May 18, 2022

$769.99

The first and only dual-sided Shimano’s GRX power meter crankset!

Clear selection

4iiii PRECISION PRO Shimano GRX RX810 Dual-Sided Power Meter

The 4iiii PRECISION PRO Shimano GRX RX810 Dual-Sided Power Meter combines 4iiii’s patent pending 3-D tri-axial strain gauge technology with Shimano’s GRX RX810 crank. The result is an accurate, lightweight and highly reliable power meter crankset that is capable of tacking the most grueling workouts or races.

The dual-sided 4iiii GRX crankset features independent left/right power measurement. With a power sensor located on the inside of both crank arms, the power meter can measure the forces generated by each leg individually.

The 4iiii is also extremely lightweight, adding approximately 20 grams to the Shimano GRX crankset. The power meter is compatible with both ANT+ and Bluetooth SMART devices and is accurate to +/- 1.0%.

 

Options

This power meter comes in the following crank arm lengths: 170 mm | 172.5 mm | 175 mm

Please note, every size comes with a 40T chainring.

 

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

Compatibility

Bottom Bracket: This power meter uses a 24 mm Shimano spindle and must be used with a 24 mm Shimano bottom bracket.

Tip - If you already have a Shimano GRX RX810 or RX600 crankset on your bike, then this power meter will fit your bottom bracket perfectly as all Shimano cranksets use a 24 mm spindle.

This power meter ships with a 1X 40T GRX chainring, however you can also install a Shimano GRX 2X chainring on the power meter.

Check Frame Clearance: Crank-arm based power meters like this one attach a sensor on the inside of the left crank arm. On some bikes, there is not enough room between the left crank arm and the chainstay for the sensor to clear the frame. Therefore, you should make sure you have at least 10 mm of clearance between the left crank arm and the chainstay - and that you don't have a bottom bracket mounted rear brake (used on some aero and TT bikes). The important area to measure is right in the middle of the crank arm. Please refer to the image below.

If you find that you have around 7-9 mm of clearance, what many people will do is simply install a 1 or 2 mm bottom bracket spacer (between the left crank arm and the frame), which will give them the clearance they need.

The clearance between the frame and left side power meter crank arm

4iiii PRECISION PRO Shimano GRX RX810 Dual-Sided Specs

Name4iiii PRECISION 2 GRX Dual Side
Bike TypeGravel
Location of Power MeasurementCrank Arm
Left or Both Legs MeasuredBoth
Independent Left/Right MeasurementYes
InstallationMore involved (60 min. estimated)
Crank Arm MaterialAluminum
Communication ProtocolANT+ and Bluetooth SMART
Claimed Accuracy+/- 1.0%
Automatic Temp. CompensationYes
Weight20 grams (added weight)
Battery TypeCR2032 coin cell
Battery Life100 hours
Method of Cadence MeasurementAccelerometer
Warranty3 years

In the Box

  • 4iiii Power Meter with chainring
  • 2 CR2032 coin cell batteries
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