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Shimano Ultegra R8000 Precision 3 Left-Side Power Meter

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Why We Like The Shimano Ultegra R8000 Precision 3 Left-Side Power Meter

Training with power data is one of the best ways to gauge our progress, as power numbers remain consistent and are less affected by outside variables. This left-side power meter from 4iiii is an easy way to outfit our bikes with an accurate, reliable power meter. It sets itself apart from other single-sided power meters thanks to 4iiii's patented 3 power measurement, which measures the strain on the crank arm from all three dimensions, ensuring every twist and flex gets represented as accurate wattage.


  • Single-sided power meter for Shimano Ultegra cranks
  • Gives reliable power measurements with +/- 1% accuracy
  • 3D power technology measures 3-dimensional strain
  • Connects wirelessly with Bluetooth and ANT+ devices
  • Compatible with Shimano Ultegra R8000 11-speed crankset
  • Item #FII0008
Hollowtech II aluminum
Powermeter Type
single-sided crank arm
Shimano Ultegra R8000 cranksets
3 dimensional power measurement, dual-channel ANT+ and Bluetooth connections
Accuracy (+/-)
Operating Time
100+ hours
Claimed Weight
[172mm] 7.4oz (211g)
Manufacturer Warranty
3 years
road cycling

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