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4iiii PRECISION PRO Shimano Ultegra R8000 Dual-Sided Crankset

Josh Matthew March 16, 2020
4.00 out of 5 based on 1 customer rating
(1 customer review)

$999.99 $949.99

4iiii’s 3-D tri-axial strain gauge technology, dual-sided power and +/- 1.5% accuracy

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4iiii PRECISION PRO Shimano Ultegra R8000 Dual-Sided Crankset

The 4iiii PRECISION PRO Shimano Ultegra R8000 Dual-Sided Crankset combines 4iiii’s patent pending 3-D tri-axial strain gauge technology with Shimano’s best-selling Ultegra R8000 crank. The result is an accurate, lightweight and highly reliable power meter crankset that is capable of tacking the most grueling workouts or races.

The dual-sided 4iiii R8000 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 forces generated by each leg individually.

The 4iiii is also extremely lightweight, adding approximately 20 grams to the Shimano R8000 crankset. The power meter is compatible with both ANT+ and Bluetooth SMART devices and is accurate to +/- 1.5%.


4iiii Dual-Sided Power Meter 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.


In the Box

  • 4iiii Dual-Sided Crankset
  • 2 CR2032 batteries
  • Quick Start guide


4iiii PRECISION PRO Shimano Ultegra R8000 Crankset Specs

Name4iiii PRECISION PRO R8000 Crank
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+/- 1.5%
Weight694 grams (170 mm, 50-34T)
Battery TypeCR2032
Battery Life100 hours
Method of Cadence MeasurementAccelerometer
Warranty3 years


1 review for 4iiii PRECISION PRO Shimano Ultegra R8000 Dual-Sided Crankset

  1. Avatar

    Brendan Dolan (verified owner)

    Great meter but…had a known problem setting it up. The battery case on the right side battery contacts needed to be moved to ensure contact with the battery. After I did that, works perfectly. Incredible service from Josh at Power Meter City. Thank you Josh, well done and thanks.

    • Power Meter City

      Power Meter City

      Hi Brendan, good to hear that! Thank you for leaving a review and for being a great customer. Let us know if there is anything else we can do in the future.

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