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4iiii Precision 2 Ultegra R8000 Left Hand Power Meter Crank

RRP £299.00
Save 16%

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4iiii develop products to improve sports performance at a competitive and professional level. Their products deliver accurate data seamlessly to help you train to win.
4iiii Precision 2 Ultegra R8000 Left Hand Power Meter Crank

4iiii Precision Power Meter cranks are a highly accurate, reliable, durable and lightweight way of measuring your power and cadence during training or competition. With the capacity to measure tri-axial strain on your crank arm, the accuracy of the power readings is second to none. 

Whether you're a professional or a person who wants to train harder, this crank arm is a valuable tool for monitoring performance and helping you push yourself to the next level. 

Compatible with ANT+ and Bluetooth devices. Single left Shimano R8000 Ultegra crank arm supplied with 4iiii Precision unit ready installed. Easy to fit yourself and the calibration process is simple. 


  • 3D power meter technology measures tri-axial strain on crank arm
  • Accurate, consistent data
  • Lightweight, compact design
  • Battery status indicator via 4iiii app
  • Compatible with ANT+, Bluetooth devices
  • User-friendly app and configurable rider compensation scale factor
  • Easy setup and maintenance
  • Over-the-air upgrade capability for adding new features and updates


  • Crank: Shimano Ultegra R8000
  • Data accuracy: +/- 1% error margin
  • Battery life: 100+ hours on 2032 coin cell battery
  • Battery status indicator: Alert at 15% battery power
  • Check your frame clearance before you order by downloading and printing the compatibility guide here.