4iiii Precision Powermeter GEN3+, for Shimano Ultegra FC-R8100, Non-Drive Side

Our 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 and backed by our industry-leading 3-year warranty, 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 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 travelled with confidence.

Ultra Low Profile
With an ultra-low profile design, the PRECISION 3 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. Our goal is to help you get faster, not to slow you down.

Waterproof
Designed to work in our tough environment. With an IPX7 waterproof rating, you can be assured that your power meter can handle the toughest conditions.

3 Year Warranty
A lot can happen in 3 years. You probably won’t need to use it, but it’s reassuring to know that all 4iiii power meters are backed by an industry-leading 3-year warranty.

Specifications

• Accuracy: +/- 1%
• Battery Type: CR2032 Coin Cell
• Battery Life: Up to 800hrs
• Waterproof Rating: IPx7
• Cadence Range: 30 - 170RPM
• Power Range: 0 - 4,000W
• Height: 5.5mm
• Weight: 9g
• Operating Temperature: 0 - 50°C
• Communication Protocols: ANT+, Bluetooth

Compatibility
A 4iiii PRECISION 3+ power meter is available ready to ride on any of the crankset configurations listed below. If your desired crankset isn't listed, we may have other compatible products.

• Shimano 105 FC-R7000
• Shimano Ultegra FC-R8000
• Shimano Ultegra FC-R8100
• Shimano Dura-Ace FC-R9100
• Shimano Dura-Ace FC-R9200
• Shimano GRX FC-RX810
• Shimano XT FC-M8100
• Shimano XTR FC-M9100

Indoors
If the weather or climate makes riding outdoors tough, your 4iiii power meter can be used with all popular indoor training apps, such as Zwift, TrainerRoad, Wahoo SYSTM, Rouvy, and more. Simply use your favourite app’s connection procedure over ANT+ or Bluetooth Smart, put your bike on a trainer, and get riding!