A black 4iiii Precision 3.0 power meter for bicycles, with a badge indicating compatibility with Apple Find My.

4iiii

4iiii 105 R7100 Precision 3.0+ Power Meter

~~£339.00~~ £309.00 Sale

Accurate ±1% power measurement with long battery life and Apple Find My integration — trusted by pros and weekend riders alike.

Crank Length: 165

165 170 172.5 175

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In Stock | Estimated 3-5 Days Delivery

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Elevate your training with the 4iiii Precision 3.0+ Power Meter, purpose-built for Shimano 105 R7100 cranksets. Designed to help cyclists maximise their performance, this left-side power meter delivers industry-leading ±1% accuracy, enhanced terrain-adaptive measurement, and dual Bluetooth/ANT+ connectivity. Whether you're chasing KOMs, racing crits, or pushing FTP goals on indoor platforms, the Precision 3.0+ delivers consistent, reliable power data every ride.

At just 9 grams of added weight, the Precision 3.0+ is discreet yet powerful, offering up to 800 hours of battery life on a single CR2032 coin cell. Its compact design doesn’t interfere with your bike’s aesthetics or ride feel, and it’s IPX7 waterproof, ready for rain, sweat, and grit. The unit also tracks real-time watts, cadence, and calorie burn, making it your go-to data tool for efficient, focused training.

What truly sets this power meter apart is its Apple Find My integration. You can track your 4iiii device anytime via iPhone, iPad, or Mac—even when it’s not active. With wireless firmware updates, an intuitive setup via the 4iiii app, and a 3-year manufacturer’s warranty, the Precision 3.0+ is an essential upgrade for serious road cyclists and performance enthusiasts alike.

Key Benefits

Crank Compatibility: Shimano 105 R7100 series (left-side crank arm)
Accuracy: ±1% – ideal for precise power-based training
Battery Life: Up to 800 hours (CR2032 coin cell)
Connectivity: Dual-band ANT+ and Bluetooth Smart
Data Tracked: Power (watts), cadence, and calories
Apple Find My: Integrated tracking when the device isn’t in use
Automatic Terrain Selector: Ensures accuracy across varied terrain
Durability: Waterproof to IPX7 rating
Minimal Weight Gain: Adds only ~9g
Warranty: 3-year manufacturer warranty
Firmware Updates: Wireless via the 4iiii mobile app

Product Specifications

Model Compatibility: Shimano 105 R7100 (left crank arm)
Measurement Type: Left-side power measurement only
Accuracy: ±1% (industry-leading precision)
Battery Type: CR2032 coin cell (user-replaceable)
Battery Life: Up to 800 hours
Connectivity:
ANT+
Bluetooth Smart (BLE)
Data Broadcast:
Power (Watts)
Cadence (RPM)
Calories burned
Apple Find My Integration: Track device location when not in use
Weight: Adds ~9 grams to crank arm
Waterproof Rating: IPX7 (water-resistant up to 1 metre for 30 minutes)
Q-Factor Impact: None (zero effect on pedal stance)
Terrain Adaptation: Automatic terrain selector for stable data output
Firmware Updates: Wireless via the 4iiii app (iOS/Android)
Installation: Factory-installed onto genuine Shimano 105 R7100 crank arm
Warranty: 3 years (manufacturer-backed)

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.