Skip to main content

4iiii PRECISION Shimano GRX RX810 Power Meter

Niel Ubod October 23, 2020


4iiii’s PRECISION power meter combined with Shimano’s GRX RX810 groupset

Clear selection


4iiii PRECISION Shimano GRX RX810 Power Meter

Introducing the all new 4iiii PRECISION Shimano GRX RX810 Power Meter. 4iiii has combined their patent pending 3-D tri-axial strain gauge technology, measured at +/- 1.0% accuracy, with Shimano’s GRX RX810 groupset. The result is one of the lightest, most affordable and most accurate direct force power meters available for gravel and adventure riders.

The 4iiii power meter measures left leg power and doubles this value to determine your total power. This left-only design allows for a power meter that is affordable, lightweight and easy to install. The power meter adds only 9 grams to your crank arm and is installed in about 10 minutes. In addition, the PRECISION is compatible with both ANT+ and Bluetooth SMART devices. This means you can use it with your favorite bicycle computer, watch or smart phone.



Most Affordable DFPM

The 4iiii PRECISION is one of the most affordable, ready to ride direct force power meters available.

High Level of Accuracy

The PRECISION is accurate to within +/- 1.0%. This compares to average accuracy of +/- 1.0-2.0% for most other power meters.

Lightest Power Meter

At only 9 grams of added weight, the PRECISION is the lightest power meter you can buy!

Easy to Install

Installation is a breeze. Just swap it out for your current left-side crank arm and you’re ready to ride! Installation takes minutes…not hours.

ANT+ & Bluetooth SMART

The power meter transmits data via both ANT+ and Bluetooth SMART so you can use it with a wide range of devices.


The power meter is available in the following crank arm lengths:  170 mm | 172.5 mm | 175 mm



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

Please note, this product requires a Shimano Crankarm Cap Tool (sold by us separately) for installation.


In the Box

  • 4iiii PRECISION Shimano GRX RX810 Power Meter
  • CR2032 Battery
  • Quick Start guide


4iiii PRECISION Shimano GRX RX810 Specs

Bike TypeGravel
Location of Power MeasurementCrank Arm
Left or Both Legs MeasuredLeft only
Independent Left/Right MeasurementNo
Communication ProtocolANT+ and Bluetooth SMART
Claimed Accuracy+/- 1.0%
Weight9 grams (added weight)
Battery TypeCR2032 coin cell
Battery Life100 hours
Method of Cadence MeasurementAccelerometer
Warranty3 years



There are no reviews yet.

Be the first to review “4iiii PRECISION Shimano GRX RX810 Power Meter”

Shopping Cart