4iiii Precision Ultegra 8000 Left Side Power Meter

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4iiii Precision Ultegra Left Side Power Meter sport factory battery cover view

4iiii brings power based training to the masses with the Precision line of left side power meters.  Requiring only a non-drive crank arm change with the 4iiii Power Meter Ultegra crank arm, it takes only minutes to install.  Whether you’re a pro or simply training hard, PRECISION power meters deliver industry-leading accuracy, highly dependable cadence data, 3D powermeter technology capable of measuring tri-axial strain on your crank arm. Designed to be durable and lightweight, compatible with  ANT+ and Bluetooth head units, PRECISION helps you train harder and smarter.

*Please note crank length 165mm is non-stock and may take 3-5 business days to ship


  • 3D powermeter technology (patent pending) measures tri-axial strain on your crank arm
  • Accurate, consistent data
  • Lightweight, compact design
  • Battery status indicator via 4iiii app
  • Compatible with ANT+, Bluetooth Smart head units, smartphones, and other 4iiii products
  • User-friendly app and configurable rider compensation scale factor
  • Easy setup and maintenance


  • Weight: 9 grams
  • Data accuracy: +/- 1% error margin
  • Battery life: 100+ riding hours on 2032 coin cell battery


NOTE: check your frame clearance before ordering by downloading and printing the compatibility guide 


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