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

Close-up of a dark gray road bicycle frame and crankset against a brick wall, with a person crouching beside holding a smartphone.

Close-up of a person wearing black gloves adjusting a silver metal component on a black bicycle crankset, with tools on a wooden workbench in the foreground.

Close-up of a black road bicycle crankset with a 105SR component and chainring, attached to a matte black frame, with part of the rear wheel and chain visible against a light gray studio background.

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

4iiii

4iiii 105 R7100 Precision 3.0+ Power Meter

~~£345.00~~ £309.00 Sale

Shimano 105 R7100 left-sided power meter with ±1% accuracy, up to 800-hour battery life and ANT+/Bluetooth connectivity.

Crank Length: 165

165 170 172.5 175

Product variants

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Train with reliable power data using the 4iiii PRECISION 3.0+ power meter built onto a Shimano 105 FC-R7100 left crank arm. Designed for road cyclists taking a more structured approach to riding, it provides power and cadence information without adding unnecessary bulk to the bike.

The non-drive-side sensor delivers ±1% power accuracy, communicates with compatible ANT+ and Bluetooth devices and offers up to 800 hours of riding from a replaceable CR2032 battery. Its slim 5.5 mm profile and IPX7 water resistance make it suitable for year-round training.

Apple Find My support offers an additional way to locate the power meter using a compatible Apple device when it is not in use. Choose the correct crank length and check crank and frame compatibility before ordering.

Product Specifications

Crank compatibility: Shimano 105 FC-R7100 left crank arm
Available crank lengths: 165, 170, 172.5 and 175 mm
Measurement: Left crank arm, non-drive side
Power accuracy: ±1%
Connectivity: ANT+ and Bluetooth Smart
Battery: Replaceable CR2032; up to 800 hours
Power range: 0–4,000 W
Cadence range: 30–170 rpm
Water resistance: IPX7
Pod profile: 5.5 mm; adds approximately 9 g
Apple Find My: Supported with compatible Apple devices
Warranty: 3 years

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.