How do you define success? Whether you are fighting for a Kona slot, spending countless hours on the indoor trainer or striving for a personal best; one thing we know, success takes time.

The Precision 3 takes years of powermeter expertise and our patented 3D strain gauge technology, and condenses them into a thinner form factor – to expand frame compatibility.

With up to 800 hours of battery life, +/-1% accuracy and backed by our legendary 3-year warranty, the PRECISION 3 Powermeter will be your trusted training tool for years to come.

The gold standard


The best in the world train and race knowing that their data is consistent and connections are bulletproof with Precision 3


4iiii Precision 3 leads the way in power data accuracy, with lab validated +-1% power accuracy.


A single coin 2032 cell now lasts 4 times longer, up to 800 hours.


Small but mighty. The pedal pod is 25% thinner than our previous generation, a mere 5.5mm thick and weighs just 9g.


Shimano Dura Ace

Shimano Ultegra

Shimano Ultegra

Shimano 105


Shimano GRX

Shimano Deore XT

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.

Take advantage of local warranty replacements and support

Please be aware that 4iiii warranty claims are honoured in the country of purchase, South Africa cannot support Global warranty claims. Internationally purchased warranty units are required to be returned to the purchased dealer or Canadian head-office directly.


  • 3D powermeter technology
  • Industry-leading +/- 1% accuracy
  • Ultra low-profile for wider frame compatibility
  • Indicator LED
  • Dual-channel ANT+ and Bluetooth Smart
  • 3 year warranty
  • Scale factor adjustment


  • Module Weight 9g (0.3oz)
  • Power Range 0-4000W
  • Cadence Range 30-170RPM
  • Communication Protocols ANT+, Bluetooth
  • Operating Temperature 0 to 50°C (32-122°F)
  • Battery Type CR2032 lithium ion coin cell
  • Battery Life up to 800 hours
  • Waterproof Rating IPX7
  • Battery Type CR2032 lithium ion coin cell
  • Height 5.5mm

Device Compatibility

4iiii PRECISION 3 power meters use both the ANT+ PWR and Bluetooth Smart Cycling Power Service standards, which makes them compatible with nearly every headunit, smartphone, or computer you wish to connect to.

Check your recording device documentation for ANT+ PWR or Bluetooth Smart (also called BLE, BTLE, or BT4.0) Cycling Power Service capability.

How does it work?

Choose the  Shimano left crank arm you want at checkout, and you’ll receive it with PRECISION 3 installed. 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
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