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4iiii PRECISION Shimano Ultegra R8000 Power Meter

Josh Matthew July 20, 2019
5.00 out of 5 based on 1 customer rating
(1 customer review)


4iiii’s PRECISION power meter combined with Shimano’s Ultegra R8000 groupset

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4iiii PRECISION Shimano Ultegra R8000 Power Meter

Introducing the all new 4iiii PRECISION Shimano Ultegra R8000 Power Meter. 4iiii has combined their patent pending 3-D tri-axial strain gauge technology, measured at +/- 1.0% accuracy, with Shimano’s best of breed Ultegra R8000 groupset. The result is one of the lightest, most affordable and most accurate direct force power meters available.

The PRECISION determines your total power based on the force that is generated by your left leg. This left-only design allows for a power meter that is lightweight and easy to install. Specifically, the power meter adds only 9 grams to your crank arm and is installed in about 10 minutes. In addition, the PRECISION is compatible with both ANT+ and Bluetooth SMART devices. This means you can use it with your favorite bicycle computer, watch or smart phone.



• Affordable: One of the most affordable direct force power meters available at $449
• Lightweight: The lightest direct force power meter available adding only 9 grams of weight
• Dual ANT+/BLE: Compatible with both ANT+ and Bluetooth SMART devices
• Accurate: Accurate to within 1.0%, putting it in the top tier of power meters
• Easy Installation: Quick and easy to install. Just swap out your left crank arm and you’re done!



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 Shimano Ultegra R8000 Power Meter
  • Quick Start guide



Name4iiii PRECISION Ultegra R8000
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

1 review for 4iiii PRECISION Shimano Ultegra R8000 Power Meter

  1. Avatar

    R. Gannon (verified owner)

    Works perfectly! No issues with the unit and super easy to use. I’m using with Wahoo bolt and is seamlessly easy. Had an initial fitting issue with frame clearance but Josh was super helpful and I was up and running same day. I wish more businesses were this way.

    • Power Meter City

      Power Meter City

      Hi Rob. Thanks for the review on your 4iiii PRECISION R8000. I’m glad we could get you squared away and I hope you continue to enjoy it.

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