4iiii

4iiii GRX Precision 3.0 Power Meter

~~£379.00~~ £349.00 Sale

Accurate ±1% power tracking with long battery life and Apple Find My support — precision performance for every ride.

Crank Length: 170

170 172.5 175

Product variants

In Stock | Estimated 3-5 Days Delivery

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Take your gravel riding and training to the next level with the 4iiii GRX Precision 3.0 Power Meter. Whether you're chasing podiums, tackling tough off-road terrain, or fine-tuning your performance on an indoor trainer, this power meter delivers exceptional accuracy and reliable data to help you reach your goals. Designed for maximum efficiency, it seamlessly integrates with your Shimano GRX crankset, ensuring a lightweight and unobtrusive addition to your bike.

Built for precision and durability, the Precision 3.0 Power Meter offers an impressive ±1% accuracy, ensuring your power output is always on point. With an 800-hour battery life, it’s ready for long adventures and intense training blocks. Plus, its automatic terrain selector adapts to changing surfaces, giving you more consistent readings whether you're riding on gravel, road, or trails. Waterproof and lightweight, it’s built to handle the toughest conditions, ensuring you stay focused on your ride.

Each Ride Ready PRECISION power meter comes pre-installed on a brand-new Shimano GRX crank arm, ready to fit Hollowtech II bottom brackets. With Bluetooth and ANT+ connectivity, it pairs effortlessly with your cycling computer or training app, providing real-time power metrics to track your progress. Backed by a 3-year industry-leading warranty, the 4iiii GRX Precision 3.0 is the ultimate tool to help you push your limits and redefine success.

Key Benefits

±1% power accuracy for precise training data
Up to 800 hours of battery life (CR2032 coin cell)
Lightweight design, adding only 9g to the crank arm
Automatic terrain selector for consistent power readings
Waterproof (IPX7 rating) for all-weather performance
Bluetooth & ANT+ connectivity for seamless device pairing
Pre-installed on a Shimano GRX crank arm
Compatible with Hollowtech II bottom brackets
Backed by a 3-year warranty for peace of mind

Product Specifications

Accuracy: ±1% power measurement
Battery Life: Up to 800 hours (CR2032 coin cell battery)
Connectivity: Bluetooth & ANT+ compatibility
Weight: Adds only 9g to the crank arm
Waterproof Rating: IPX7 (fully protected against water immersion)
Crank Arm Compatibility: Pre-installed on Shimano GRX crank arms
Bottom Bracket Compatibility: Fits Hollowtech II bottom brackets
Automatic Terrain Selector: Adjusts for different riding surfaces
Firmware Updates: Wireless updates via the 4iiii app
Temperature Compensation: Ensures accurate readings in varying conditions
Warranty: 3-year industry-leading warranty

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.