4iiii Precision Dura-Ace 9100 Left Side Power Meter

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4iiii Precision Dura-Ace 9100 Left Side Power Meter sport factory

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 Dura-Ace 9100 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.


  • 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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