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4iiii PRECISION Power Meter For Shimano DURA-ACE 9000

Josh Matthew July 21, 2019
5.00 out of 5 based on 5 customer ratings
(5 customer reviews)

$599.99 $399.99

4iiii’s accuracy and durability paired with Shimano’s top end DURA-ACE group set!

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4iiii PRECISION Power Meter For Shimano DURA-ACE 9000

Used by the World Pro Etixx-Quick-Step Team, the 4iiii PRECISION Power Meter for Shimano DURA-ACE 9000 is the lightest, most affordable direct force power meter available. The added weight of the 4iiii PRECISION is only 9 grams and it is accurate to within +/- 1%.

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.

In addition to being affordable, lightweight and highly accurate, the 4iiii PRECISION measures precise cadence data, has 3D power meter technology capable of measuring tri-axial strain and is compatible with both ANT+ and Bluetooth SMART devices.



Crank arm lengths: 165 mm | 170 mm | 172.5 mm | 175 mm



The 4iiii PRECISION Power Meter is compatible with all Shimano Hollowtech II road cranks.


In the Box

  • 4iiii PRECISION Power Meter
  • 2032 coin cell battery
  • Quick Start guide



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
Warranty1 year

5 reviews for 4iiii PRECISION Power Meter For Shimano DURA-ACE 9000

  1. Avatar

    Jeremy (verified owner)

    Bought this a while ago and had been training with it regularly, product arrived in a couple of days and overall user experience had been great.

    Pairing with Garmin 520 is easy, updating the firmware via mobile app is a snap too, most important of all I could finally train with peace in mind knowing I’m within the correct zones and prepare for the strength and skills needed later for climbing.

    Great product and excellent services, highly recommended.

    • Power Meter City

      Power Meter City

      Hi Jeremy, We have had great success with the PRECISION in terms of both accuracy and reliability. Glad you are enjoying it. Let us know if there is anything else we can do for you.

  2. Avatar

    Wyatt Du Plessis (verified owner)

    Amazing service.. This is my 2nd power meteri bought here. The service is very good and I am extremely happy about the product.. I have recommended power meter city to all my friends here is South Africa

    • Power Meter City

      Power Meter City

      Hi Wyatt. Thanks for the review and for being a great customer. We’re here if there is anything else we can do!

  3. Avatar

    Gaz Faz (verified owner)

    What a great addition to the bike. Very easy to fit and very easy to pair with your Garmin. It has allowed me to reel in the power and train in the correct zones for longer.
    Fast delivery and a great service.

    • Power Meter City

      Power Meter City

      Hi Gaz. Thanks for the review. Keep crushing those zones and let us know if there is anything else we can help you with!

  4. Avatar

    Aaron Elliott (verified owner)

    I had great service. I had a lot of questions and they spent the time to answer everything for me. Customer service was outstanding. The power meter was also very easy to install and pair with Garmin. Been using this power meter for several months and no issues. I would buy from them again and have referred my friends as well.

    • Power Meter City

      Power Meter City

      Hi Aaron. I’m glad we could help you out on your 4iiii. They are great power meters. We hope you continue to enjoy it and are here if there is anything else that you need!

  5. Avatar

    Bob Brubaker (verified owner)

    I love my 4iiii Precision Power meter. I was trying to find an appropriate power meter to go with my new ride and I am most grateful for this power meter. It’s comparable in reliability and function to my SRAM and my Power Tap power meters. Much more reasonable price with similar results. You can’t beat it. And most grateful for fast dependable service from Power Meter City.

    • Power Meter City

      Power Meter City

      Hi Bob. Thanks for leaving us a review. We’re glad to hear it’s working out for you. Thank you for your business!

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