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4iiii PRECISION Power Meter for Shimano XT M8100/8120

Josh Matthew October 10, 2021


4iiii power for your Shimano XT M8100/8120/8130 crankset!

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4iiii PRECISION Power Meter For Shimano XT M8100/8120

The 4iiii PRECISION Power Meter for Shimano XT M8100/8120 brings 4iiii power to your Shimano XT crankset! The 4iiii power meter is a left side crank arm-based power meter. You simply install it in replace of your currently left side crank arm and you are powered up! The 4iiii will take the power that is generated by your left leg and double it in order to determine your total power output.

The 4iiii is a highly accurate power meter. It’s built-in accelerometer can measure precise cadence data and it has 3D power meter technology capable of measuring tri-axial strain. The result is a power meter that is accurate to +/- 1.0%.

The 4iiii Shimano XT M8100/8120 Power Meter features 100 hours of battery life and is compatible with both ANT+ and Bluetooth SMART devices.



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 | 175 mm



The 4iiii power meter is compatible with XT M8100/8120/8130 cranksets. It is also compatible with all other Shimano x100/x120/x130 series MTB cranksets such as the XTR M9100/M9120/M9130 or the SLX M7100/7120/7130.

It is not compatible with x000 series crankset such as the XTR M9000’s, XT M8000’s or SLX M7000’s.

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


Tools Needed for Installation

  • Shimano Crank Arm Cap Tool (sold by us separately)
  • 5 mm Allen key


In the Box

  • 4iiii PRECISION Power Meter
  • 2032 coin cell battery
  • Quick Start guide


4iiii PRECISION For Shimano XT M8100/8120 Specs

Name4iiii PRECISION XT M8100/8120
Bike TypeMTB
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



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