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4iiii PRECISION Shimano Ultegra R8000 Power Meter

Josh Matthew September 11, 2018


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

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About the 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.


4iiii Ultegra R8000 Highlights

→ Affordable: One of the most affordable direct force power meters available
→ Lightweight: The lightest direct force power meter available
→ Dual ANT+|BLE: Compatible with both ANT+ and Bluetooth SMART devices
→ Accurate: Accurate to within 1.0%
→ Easy Installation: Quick and easy to install


4iiii Ultegra R8000 Options

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


4iiii Ultegra Power Meter Compatibility

The 4iiii PRECISION Shimano Ultegra 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


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