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4iiii PRECISION PRO Shimano XTR 9100/9120 Dual-Sided Power Meter

Josh Matthew May 23, 2024

Original price was: $1,079.99.Current price is: $971.99.

Save: $108

4iiii dual-sided power on a Shimano XTR 9100/9120 crankset!

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4iiii PRECISION PRO Shimano XTR 9100/9120 Dual-Sided Power Meter

The 4iiii PRECISION PRO Shimano XTR 9100/9120 Dual-Sided Power Meter brings 4iiii’s dual-sided power to Shimano’s XTR 9100/9120 crankset! The result is an accurate, lightweight and highly reliable power meter crankset that is capable of tacking the most grueling MTB workouts or races. In fact, the 4iiii power meter is accurate to +/- 1.0%.

The dual-sided 4iiii XTR crankset also 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 extremely lightweight. It only adds about 20 grams to the Shimano XTR crankset. You can also use the power meter with your favorite bike computer, phone or training app as it has dual ANT+ and Bluetooth SMART compatibility.


Key Product Details


This power meter is compatible with XTR M9100/9120/9130 cranksets. It is also compatible with all other Shimano x100/x120/x130 series MTB cranksets such as the XT M8100/M8120/M8130 or the SLX M7100/7120/7130. See Compatibility tab for more information.

Power Measurement:

This 4iiii power meter has a power sensor on both crank arms and measures power from both legs. It is also able to measure your left vs. right leg power.

Key Features:

Dual-leg power measurement, can measure left vs. right leg power, accurate to within +/- 1.0%, lightweight at only 20 grams of added weight, 100 hours of battery life, CR2032 user-replaceable battery, ANT+ and Bluetooth compatible, 3-year warranty. See Specs tab for more information.

Advice From Our Staff:

If you are looking for a dual-sided Shimano XTR power meter crankset, this is for you. In fact, it’s the only dual-sided OEM XTR crankset with power.


Options For This Power Meter

  • Crank arm lengths: 170 mm | 175 mm

Please note, chainrings are not included.


Other Versions to Consider

Left Side XTR 9100/9120: We also sell the 4iiii PRECISION Shimano XTR M9100 Power Meter which is a left side crank arm only. It is more affordable, however it only measures left leg power.


Crankset: This power meter uses a 24 mm Shimano MTB spindle, Therefore, it must be used with a 24 mm Shimano bottom bracket.

Tip - If you already have a Shimano MTB crankset on your bike, then this power meter will fit your bottom bracket perfectly, This is because all Shimano cranksets use a 24 mm spindle.

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. Also, make sure 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). This should give you the necessary clearance.

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

4iiii PRECISION PRO Shimano XTR 9100/9120 Dual-Sided Specs

Name4iiii PRECISION 2 XTR Dual-Sided
Bike TypeMTB
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 (sensor) | 210 grams (170 mm)
Battery TypeCR2032 coin cell
Battery Life100 hours
Method of Cadence MeasurementAccelerometer
Warranty3 years

In the Box

  • 4iiii Power Meter
  • 2 CR2032 coin cell batteries

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.

  • 8 mm Allen key
  • Shimano Direct Mount Lock Ring Tool

Common Questions and Answers

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


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