Shimano Ultegra R8000 left crank with 4iiii "Precision 3" power meter

Shimano Ultegra R8000 left crank with 4iiii Precision 3 power meter

Whether it's battling for a spot on the Kona Ironman start line, striving for a personal best, or simply putting in countless hours on an exercise bike, one thing is certain: success takes time. With up to 800 hours of battery life and +/- 1% accuracy, the 4iiii Precision 3 power meter is a reliable, quality training tool that will last for many years.

The Powermeter inherits the robust and lightweight design of its predecessor. Improvements include longer runtime and even more compact dimensions, offering extended frame compatibility (5.5mm thick instead of 7.5mm). In addition, the Precision 3 model is equipped with an LED indicator that provides direct feedback on operating status, battery status, and calibration success.

Ready to ride. The 4iiii power meter sensor comes pre-assembled on Shimano Hollowtech II bottom bracket-specific crank arm. Once mounted on the bike and connected to the control box or computer, you can immediately start recording your power.

Technical characteristics of the 4iiii Precision 3 power meter sensor:

Power measurement method: 3D measurement technology patented by 4iiii
Accuracy: +/- 1%
Power measurement range: 0 – 4000 W
Cadence range: 30 – 170 rpm
Battery Life: Up to 800 hours (manufacturer dependent)
Battery type: CR2032 (button cell)
Wireless communication: Wi-Fi (ANT+ / Bluetooth)
Status display: LED indicator
Compatibility with apps: Zwift, TrainerRoad, SYSTM, etc.
Temperature range: 0 – 50°C (operating) / -40 – 60°C (storage)
Protection index (sealing): Certified IPX7
Dimensions: 63.79 x 26.42 x 5.5mm
Weight: Approx. 9 g (power meter without crank arm; manufacturer's specification)

Scope of delivery:

a Shimano Shimano R8000 left crank equipped with the 4iiii Precision 3 power meter