Dual-Side Powermeter

Ridden by the pros, PRECISION PRO dual-side power meters deliver all the benefits of our left-side model (exceptional accuracy, lightweight design, ANT+ and Bluetooth compatibility, 3D powermeter technology), plus a specific breakdown of left and right wattage. Perfect for those who need specific power output from each crank side, or anyone who simply wants the best power meter on the market.

The PRECISION PRO Ride Ready comes pre-installed on a new Shimano DURA-ACE FC-9000 series crankset you purchase from us.


Shimano Dura Ace

Shimano Ultegra

Check your bike frame clearance with the compatibility guide BEFORE placing your order. Any compatibility issues encountered after purchase will be subject to our terms and conditions.


  • 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: 25 grams
  • Data accuracy: +/- 1% error margin
  • Battery life: 100+ riding hours on 2032 coin cell battery
  • Battery status indicator: Alert at 15% battery power

How does it work?

Choose the specific Shimano Dura-Ace crankset you want at checkout. You'll receive a PRECISION PRO powermeter installed on your new crankset. The crankset can be installed easily with the use of a Shimano crank installation tool, hex bits and a torque wrench. Install the 4iiii app, pair, update, calibrate and ride.


Software & Documentation

Display Compatibility


  • CatEye Cycling
  • Endomondo
  • Strava 
  • TrainerRoad
  • Wahoo Fitness: Workout Tracker 
  • Plus other apps supporting Bluetooth Smart/LE bike power devices

Android Apps

  • CateEye Cycling 
  • Endomondo
  • Strava 
  • Wahoo Fitness: Workout Tracker 
  • Plus other apps supporting Bluetooth Smart/LE bike power devices


  • Stealth evo+ 
  • Stealth 50 
  • Strada Smart
  • Padrone Smart 
  • Padrone Smart+


  • Edge 500 
  • Edge 510 
  • Edge 520 
  • Edge 800 
  • Edge 810 
  • Edge 820 
  • Edge 1000 
  • Edge Explore 1000 
  • epix 
  • Forerunner 310XT 
  • Forerunner 910XT 
  • Forerunner 920XT
  • fenix 2 
  • fenix 3 
  • fenix 3 HR


  • M450 
  • V800 BTLE 
  • Please note: the Polar V650 is not compatible


  • Ambit3 Sport (Bluetooth)
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