4iiii PRECISION Shimano DURA-ACE 9100 Power MeterSeptember 9, 2022
$439.99 – $489.99
The 4iiii PRECISION is now available in Shimano’s latest evolution of the FC-R9100!
4iiii PRECISION Shimano DURA-ACE 9100 Power Meter
Shimano’s lightweight evolution of the FC-R9100 is now available as a 4iiii PRECISION power meter! Used by the World Tour teams Quick-Step Floors and Bora-hansgrohe, the 4iiii PRECISION Shimano DURA-ACE 9100 Power Meter is the lightest, most affordable direct force power meter available. The added weight of the 4iiii PRECISION is only 9 grams. Even better yet, it is accurate to within +/- 1.0%.
The 4iiii PRECISION is a left-only crank arm-based power meter and replaces your current left side crank arm. The 4iiii takes the power that is generated by your left leg and doubles it in order to determine your total power output. All PRECISION models run off a CR2032 battery, feature approximately 100 hours of battery life and support both ANT+ and Bluetooth SMART wireless protocols.
Key Product Details
This power meter is compatible with Shimano DA9100 cranksets. It can also be installed on other Shimano road cranksets, as long as they use Shimano’s Hollowtech II interface. See Compatibility tab for more information.
This 4iiii power meter measures left leg power and doubles the value to account for both legs (assumes both legs are generating the same force).
New 4iiii DA9100 PRECISION 3!
The all new 4iiii DA9100 PRECISION 3 Power Meter features the following improvements over the version 2:
- 800 hours of battery life – the longest coin cell battery life in a power meter on the market!
- Sleeker, slimmer profile making most incompatibility issues a thing of the past.
- Stronger antenna for even better connectivity.
- Indicator light for battery life, successful zero-offset and when the unit has been turned on.
Affordable, accurate to within +/- 1.0%, lightweight at only 9 grams of added weight, 800 hours of battery life (PRECISION 3), CR2032 user-replaceable battery, ANT+ and Bluetooth compatible, easy to install, 3-year warranty. See Specs tab for more information.
Advice From Our Staff:
4iiii left side crank arms are some of our best-selling units. They work with most Shimano cranksets, are affordable and easy to install. The one consideration is they only measure left leg power compared to some other power meters that measure power from both legs (those versions usually cost more however).
Options For This Power Meter
- Versions: PRECISION 2 | PRECISION 3 (see above for PRECISION 3 differences)
- Crank arm lengths: 165 mm | 170 mm | 172.5 mm | 175 mm
Other Versions to Consider
Dual-Sided DA9100 Crankset: We also sell the 4iiii PRECISION PRO Shimano DURA-ACE 9100 Dual-Sided Crankset which is a complete crankset. It is more expensive, however it measures power from both legs.
Crankset: This 4iiii power meter is compatible with Shimano DURA-ACE 9100 cranksets.
Please note, the power meter can also be installed other Shimano road cranksets, as long as they use Shimano's Hollowtech II interface. These cranksets can easily be identified by the two opposing pinch bolts that are used to secure the left side crank arm. Please see the image below and contact us if you have any questions on compatibility.
Check Frame Clearance: Crank-arm based power meters 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 for the PRECISION 2 and 8 mm of clearance for the PRECISION 3. 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 your clearance is close but not quite sufficient, 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 provide you with the clearance you need.
4iiii PRECISION Shimano DURA-ACE 9100 Specs
|Name||4iiii PRECISION DURA-ACE 9100|
|Location of Power Measurement||Crank Arm|
|Left or Both Legs Measured||Left only|
|Independent Left/Right Measurement||No|
|Crank Arm Material||Aluminum|
|Communication Protocol||ANT+ and Bluetooth SMART|
|Claimed Accuracy||+/- 1.0%|
|Automatic Temp. Compensation||Yes|
|Weight||9 grams (added weight)|
|Battery Type||CR2032 coin cell|
|Battery Life||Version 2: 100 hours / Version 3: 800 hours|
|Method of Cadence Measurement||Accelerometer|
In the Box
- 4iiii PRECISION Power Meter For Shimano DURA-ACE 9100
- CR2032 coin cell battery
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