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4iiii PRECISION Power Meter For Shimano DURA-ACE 9100

Josh Matthew October 11, 2021
5.00 out of 5 based on 4 customer ratings
(4 customer reviews)


The 4iiii PRECISION is now available in Shimano’s latest evolution of the FC-R9100!

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4iiii PRECISION Power Meter For Shimano DURA-ACE 9100

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 Power Meter for Shimano DURA-ACE 9100 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.



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: 165 mm | 170 mm | 172.5 mm | 175 mm



The 4iiii power meter is compatible with all Shimano Hollowtech II road cranks. Please contact us if you have questions on compatibility.

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 For Shimano DURA-ACE 9100
  • 2 2032 coin cell batteries
  • Quick Start guide


4iiii PRECISION Shimano DURA-ACE 9100 Specs

Bike TypeRoad
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


4 reviews for 4iiii PRECISION Power Meter For Shimano DURA-ACE 9100
  1. Joshua S (verified owner)

    Very impressed with this PM. I’ve been using crank based for close to a decade, but when I upgraded my bike, I decided to try a new system. Super easy to install. Great app used to keep firmware updated. Zero dropped connection on my first ride, which is a huge improvement! Would recommend every time.

    • Power Meter City

      Hi Joshua! Good job on your first ride. We are glad too that it worked perfectly fine on you as expected. We hope you continue to enjoy them and please let us know if there is anything else we can do!

  2. Mark (verified owner)

    Great product, fantastic price and ideal product to keep a super light race bike as it should be. Very consistent and minimalist. Just have to be careful of customs charge if buying from Europe!

    • Power Meter City

      Hi Mark. Thanks for this amazing review! Yes, most countries do have customs charges. We hope you continue to enjoy your power meter and we are here if there is anything else we can do!

  3. cjharrer (verified owner)

    I wanted a Power Meter, but I’m also on a budget. This product was by far the easiest upgrade I’ve ever done to my bike! Pulled the left crank-arm, put a new CR-2032 battery in, installed crank arm and pedal, updated firmware, calibrated and off and riding. Pairing to my cyclometer was simple and the output matches what I get on my trainer. Definitely a good investment for me and I will incorporate into my training plan!

    • Power Meter City

      Hi Cjharrer. Thanks for this kind review on your 4iiii DURA-ACE 9100. We hope you continue to enjoy them and please let us know if there is anything else we can do!

  4. cendres (verified owner)

    Dollar for dollar, I think this is the best single-sided PM going for those on a budget. It’s been 100% reliable in all sorts of messy conditions and has proven to match up very well with power numbers from my Kickr. PM City shipping was super quick and pricing was very fair. Will be a repeat customer.

    • Power Meter City

      Hi Cendres. Thanks for the review! Not only are you getting accurate, consistent data…but you got a DURA-ACE 9100 crank arm to boot – not too shabby 🙂 We hope you continue to enjoy it.

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