4iiii PRECISION PRO Shimano DURA-ACE 9100 Dual-Sided CranksetSeptember 20, 2022
4iiii’s left/right power measurement on Shimano’s top-end DURA-ACE 9100 crankset
4iiii PRECISION PRO Shimano DURA-ACE 9100 Dual-Sided Crankset
The 4iiii PRECISION PRO Shimano DURA-ACE 9100 Dual-Sided Crankset combines 4iiii’s patent pending 3-D tri-axial strain gauge technology with Shimano’s top-end DURA-ACE 9100 crankset. The 4iiii PRECISION DA 9100 Dual-Sided Power Meter 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 force generated by each leg individually.
In addition to +/- 1.0% accuracy and dual ANT+ and Bluetooth SMART compatibility, the 4iiii PRECISION is extremely lightweight, only adding approximately 40 grams to the Shimano DA 9100 crankset. The 4iiii PRECISION uses a coin cell 2032 battery with a 100-hour battery life.
Key Product Details
This power meter is compatible with 2×11 road drivetrains and 24 mm Shimano bottom brackets. Most customers that buy it already have a Shimano DA9100 crankset on their bike and therefore, it’s an easy swap. However, it can be used on any road bike as long as its 2×11 with a 24 mm bottom bracket. See Compatibility tab for more information.
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.
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:
This is a great option for customers with a Shimano DA9100 drivetrain that want to keep an OEM DA9100 crankset on their bike but add power. We also like that fact that this crankset measures power from both legs and has a 3-year warranty, which is longer than most power meters.
Options For This Power Meter
- Chainrings: 50/34 | 52/36 | 53/39
- Crank arm lengths: 165 mm | 170 mm | 172.5 mm | 175 mm
Other Versions to Consider
Left Side DA9100: We also sell the 4iiii PRECISION Shimano DURA-ACE 9100 Power Meter which is a left side crank arm only. It is more affordable, however it only measures left leg power.
Bottom Bracket: This power meter is compatible with 2x11 road drivetrains and 24 mm Shimano bottom brackets. Most customers that buy it already have a Shimano DA9100 crankset on their bike and therefore, it's an easy swap. However, it can be used on any road bike as long as its 2x11 with a 24 mm bottom bracket.
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.
4iiii PRECISION PRO Shimano DURA-ACE 9100 Power Meter Specs
|Name||4iiii PRECISION 2 PRO 9100|
|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%|
|Active Temperature Compensation||Yes|
|Weight||694 grams (170 mm, 50-34T)|
|Battery Type||2032 coin cell|
|Battery Life||100 hours|
|Method of Cadence Measurement||Accelerometer|
|BCD||110 4-bolt asymmetric|
|Spindle Size||24 mm|
In the Box
- 4iiii DURA-ACE 9100 Power Meter Crankset
- 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.
- Shimano Crank Arm Cap Tool
- 5 mm Allen key