4iii Innovations Left crank arm with Precision 3+ Ultegra R8100

Most powerful unit to date, compressed into a smaller, lighter package and featuring support for Apple Find My, the PRECISION 3+ Powermeter is a proven choice of pros and weekend warriors alike. Whether you’re fighting for a Kona qualification spot, logging countless hours on virtual riding platforms or looking to better your time up the local KOM segment, you want accurate and reliable tools to unlock your potential. With up to 800 hours of battery life, an automatic terrain selector, +/-1% accuracy, the PRECISION 3+ Powermeter will be your trusted tool for years to come.

How does it work?
The PRECISION 3+ Powermeter is so much more than a power meter. It’s your training partner that offers peace of mind. While you are riding, your PRECISION 3+ Powermeter will transmit watts, cadence, and calories to your head unit of choice. While the power meter is not in use, Find My is enabled and allows you to see its location on a map. You can add your power meter to the Find My app and locate it on an iPhone, iPad, Mac or using the Find Items app on an Apple Watch.

In the Box
Once your ride-ready PRECISION 3+ Powermeter arrives, it just needs to be installed on your bike using the standard Shimano crank installation process. Connect a head unit or computer, and you can start riding with power. Connect to the Find My app with your iPhone or iPad to start tracking your power meter.

Features

Apple Find My: Offering the peace of mind in knowing where your power meter is.
Battery Life: With up to 800 hours of battery life, you won’t have to worry about changing your battery for years to come.
Accuracy in 3D: Not everyone has the perfect pedal stroke. With +/- 1% accuracy, 4iiii is the only crank-based power meter to use 3 strain gauges to measure all forces in your pedal stroke.
Automatic Terrain Selector: Detects the terrain you’re riding on for more responsive cadence and power feedback/data. Ride the roads less traveled with confidence.
Ultra Low Profile: With an ultra low profile design, your 4iiii power meter is compatible with more bike frames than ever before.
Light Weight: At only 9 grams the PRECISION 3+ Powermeter weighs about the same as a sip from your water bottle. Goal is to help you get faster, not to slow you down.
Waterproof: Designed to work in tough environment. With an IPX7 waterproof rating you can be assured that your power meter can handle the toughest conditions.

Tech spec

Type: Left Side
Apple Find My
ANT+ & Bluetooth Smart
Accuracy +/- 1 %
Automatic Terrain Selector
Cycling Metrics
CR2032 Coin Cell
Battery Life: Up to 800 h
Waterproof Rating: IPx7
Cadence Range: 30 - 170 rpm
Power Range: 0 - 4,000 W
Profile: 5.5 mm
Producer's weight: 9 g
Operating Temperature: 0 - 50 ºC
Storage Temperature: -40 - 60 ºC