$399.95 $499.95

SKU: #CatEye / 4iiii PRECISION Power Meter Ultegra 6800

Crank Length


A joint venture between CatEye and 4iiii Innovations. The CatEye/4iiii PRECISION power meter helps you train harder and smarter.

Compatible with most ANT+ and Bluetooth cycling computer head units and Apps on the market (see Specs tab for more info).


Whether you’re a pro or simply training hard, CatEye/4iiii PRECISION LEFT-SIDE power meters deliver industry-leading accuracy, highly dependable cadence data, 3D power meter technology capable of measuring tri-axial strain on your crank arm. Packaged into a durable, lightweight design and compatible with broad ANT+ and Bluetooth head units, CatEye/4iiii PRECISION helps you train harder and smarter.

PRECISION LEFT-SIDE Ride Ready version comes with a new ShimanoUltegra 6800 left crank arm.

Check your frame clearance before you order by downloading and printing the compatibility guide: Letter size paper (PDF)

Please Note:

Be aware of which Shimano series crankset and crank length that you have before ordering.

* Not all coupons and discounts apply to 4iiii products


  • 3D power meter technology (patent pending) measures tri-axial strain on your crank arm
  • Accurate, consistent data
  • Lightweight, compact designBattery 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
  • Over-the-air upgrade capability for adding new features and updates


  • Weight: 9 grams
  • Data accuracy: +/- 1% error margin
  • Battery life: 100+ hours on 2032 coin cell battery
  • Battery status indicator: Alert at 15% battery power

Display Compatibility

Android Apps

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


  • Stealth 50
  • Stealth Evo +
  • 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

iOS Apps

  • Endomondo
  • Strava
  • Trainer
  • RoadWahoo Fitness: Workout Tracker
  • plus other apps supporting Bluetooth Smart/LE bike power devices


  • M450
  • V800 BTLE
  • * Please note the Polar V650 is not compatible 
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Most Helpful Reviews :


Cateye / 4iiii Precision Power Meter Ultegra 6800

by - verified purchaser
This is my first PM. Always heard that training with power meter will make a huge difference in the way you measure you performance. I have to say that this powerful instrument will give you with high degree of confidence and consistency the data you need to train effectively. I have had for 4 weeks now and every day I can see how my performance is progressively improving. Power is the best measure of fitness in cycling. The higher your power is the stronger you will be.

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