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4iiii PRECISION PRO Shimano DURA-ACE 9100 Dual-Sided Crankset

Josh Matthew July 13, 2021
5.00 out of 5 based on 3 customer ratings
(3 customer reviews)


4iiii’s left/right power measurement on Shimano’s top-end DURA-ACE 9100 crankset

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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 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.


4iiii 9100 Dual-Sided Crankset Options

  • Chainrings: 50/34 | 52/36 | 53/39
  • Crank arm lengths: 165 mm | 170 mm | 172.5 mm | 175 mm



This power meter uses a 24 mm Shimano road spindle. Therefore, it is compatible with almost any bike when used with the correct bottom bracket.

Please note, this product requires a Shimano Crankarm Cap Tool (sold by us separately) for installation.


In the Box

  • 4iiii Power Meter Crankset
  • 2 CR2032 batteries
  • Quick Start guide


4iiii PRECISION PRO Shimano DURA-ACE 9100 Crankset Specs

Name4iiii PRECISION PRO 9100 Crankset
Bike TypeRoad
Location of Power MeasurementCrank arm
Left or Both Legs MeasuredBoth
Independent Left/Right MeasurementYes
InstallationMore involved (60 min. estimated)
Communication ProtocolANT+ and Bluetooth SMART
Claimed Accuracy+/- 1.0%
Weight694 grams (170 mm, 50-34T)
Battery Type2032 coin cell
Battery Life100 hours
Method of Cadence MeasurementAccelerometer
Warranty3 years


3 reviews for 4iiii PRECISION PRO Shimano DURA-ACE 9100 Dual-Sided Crankset

  1. Vivek Jangra (verified owner)

    Brilliant Powermeter, but most importantly awesome service and delivery to Brunei. I was in need of Duraace crank with powermeter but appeared not many were available around the world or couldn’t be delivered to Brunei. I found one with Powermetercity and they delivered absolute master piece ( spotless) from USA to Brunei in under 10 days. Also, the price I couldnt find any other seller who could beat the price PMC offered. Thanks a lot, I have now build my New S-Works Venge 🙂

    • Power Meter City

      Hi Vivek. Glad you found us! We hope you will enjoy your new 4iiii PRECISION PRO Shimano DURA-ACE 9100 Dual-Sided Crankset. We are here if there is anything else we can help you with!

  2. Garth Gulick (verified owner)

    Easy set up and zeroing. Got Dura-Ace as Ultegra not available, but Wright noticeably less and happy I did. Have Wahoo Kickr and love now having readings on the road.

    • Power Meter City

      Hi Garth. Thank you for this kind review on your power meter. We are glad it worked great as expected! Good luck on your future rides and please let us know if there is anything else we can help you with!

  3. John (verified owner)

    Loving the power meter! Gives you pretty much all the data any other current PMs in the market. Torque effectiveness, Pedal Smoothness etc.. Best all – no magnets to attach on your bike frame making it very minimalist design.

    • Power Meter City

      Hi John. Thanks for the review. We’re glad you like the power meter – 4iiii makes great units. Please let us know if you need anything else!

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