4iiii PRECISION PRO Shimano XTR 9100/9120 Dual-Sided Power MeterJosh Matthew May 18, 2022
4iiii dual-sided power on a Shimano XTR 9100/9120 cranket!
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.
This power meter comes in the following crank arm lengths: 170 mm | 175 mm
Please note, chainrings are not included.
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
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.
4iiii PRECISION PRO Shimano XTR 9100/9120 Dual-Sided Specs
|Name||4iiii PRECISION 2 XTR Dual-Sided|
|Location of Power Measurement||Crank Arm|
|Left or Both Legs Measured||Both|
|Independent Left/Right Measurement||Yes|
|Installation||More involved (60 min. estimated)|
|Crank Arm Material||Aluminum|
|Communication Protocol||ANT+ and Bluetooth SMART|
|Claimed Accuracy||+/- 1.0%|
|Automatic Temp. Compensation||Yes|
|Weight||20 grams (added weight)|
|Battery Type||CR2032 coin cell|
|Battery Life||100 hours|
|Method of Cadence Measurement||Accelerometer|
In the Box
- 4iiii Power Meter
- Shimano TL-FC41 Direct Mount Lockring Tool
- 2 CR2032 coin cell batteries