4iiii

4iiii Ultegra R8100 Precision 3.0+ Power Meter

~~£425.00~~ £399.00 Sale

Accurate ±1% power measurement and long battery life — trusted performance for training and racing.

Crank Length: 165

165 170 172.5 175

Product variants

In Stock | Estimated 3-5 Days Delivery

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Take your training to the next level with the 4iiii Ultegra Precision 3.0+ Power Meter—the ultimate tool for data-driven performance. This advanced power meter is designed for competitive athletes and dedicated cyclists, delivering +/-1% accuracy in power measurement. Engineered in a compact, lightweight design, it seamlessly integrates into your Shimano Ultegra crankset, adding just 9 grams. With an impressive 800-hour battery life, this power meter keeps you going for months on a single CR2032 battery, ensuring reliability for long training sessions, races, and indoor rides.

Beyond its precise power and cadence tracking, the 4iiii Precision 3.0+ is designed with Apple Find My integration, offering added security in case of loss or theft. Whether you're logging miles on virtual platforms, chasing a KOM, or fine-tuning your race strategy, this power meter provides real-time data for better performance insights. Its automatic terrain selector adapts to different riding conditions, making it an intelligent training companion on any route.

Built to withstand all weather conditions with an IPX7 water resistance rating, the 4iiii Precision 3.0+ is ready for rain, mud, and extreme temperatures. The seamless ANT+ and Bluetooth connectivity ensures compatibility with all major cycling computers and training apps. Backed by an industry-leading 3-year warranty, this power meter is a long-term investment in your cycling progression.

Key Benefits

Highly Accurate Power Measurement: ±1% precision for reliable training data
Ultra-Lightweight Design: Adds just 9g to your crank arm
Extended Battery Life: Up to 800 hours on a single CR2032 battery
Apple Find My Integration:Track your power meter via iPhone, iPad, Mac, or Apple Watch
Automatic Terrain Selector: Adjusts to different road conditions for optimised performance
Seamless Connectivity: Compatible with ANT+ and Bluetooth for use with all major cycling computers and apps
IPX7 Water Resistance: Built for all-weather riding
Shimano Ultegra R8100 Compatibility: Designed for seamless integration with Shimano Ultegra cranksets
Industry-Leading 3-Year Warranty: Reliable, long-term support from 4iiii

Product Specifications

Power Accuracy: ±1%
Weight: Adds only 9g to the crank arm
Battery Type: CR2032 coin cell battery
Battery Life: Up to 800 hours
Connectivity: ANT+ & Bluetooth
Compatibility: Shimano Ultegra R8100 crankset
Water Resistance: IPX7-rated (submersible up to 1m for 30 minutes)
Apple Find My Integration: Yes, track via iPhone, iPad, Mac, or Apple Watch
Automatic Terrain Selector: Adjusts data output based on riding conditions
Cadence Measurement: Yes
Power Output Measurement: Watts, cadence, and calorie data transmission
Firmware Updates: Wireless updates via the 4iiii app
Warranty: 3 years, industry-leading coverage
Operating Temperature: -20°C to 50°C
Crank Compatibility: Designed specifically for Shimano Ultegra R8100 left-side crank arms

Why We Choose 4iiii

We choose 4iiii because they’re at the forefront of cycling innovation, delivering world-class power meters and performance technology trusted by both pro teams and everyday riders. Their mission aligns with ours: making advanced training tools accessible, accurate, and reliable for all athletes.

Proven Accuracy – +/-1% precision power measurement for trusted performance data.
Innovation-Driven – Pioneers in lightweight, compact power meter design.
Ride Ready – Durable, weatherproof tech built for real-world cycling conditions.
Trusted by Professionals – Used by elite WorldTour cycling teams worldwide.

That’s why 4iiii is part of the North Sports collection — giving riders the tools they need to train smarter, push harder, and achieve their goals.