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 PRECISION 3+ Shimano 105 R7100

~~£345.00~~ £299.00 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

Quantity

In Stock. Estimated 3-5 Days. Free UK delivery over £50

Secure checkout Protected payment

30-day returnsView policy

Key Benefits

Measure Training Effort — Track cycling power and cadence for structured sessions and pacing.
Accurate Readings — ±1% claimed power accuracy for dependable performance data.
Long Battery Life — Up to 800 hours from a replaceable CR2032 coin cell.
Easy Connectivity — ANT+ and Bluetooth Smart support compatible cycling computers and training apps.
Low-Profile Fit — Adds approximately 9 g to the left crank arm.
Find My Integration — Locate the power meter through Apple Find My on supported Apple devices.

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.

Technical 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

Suggested Use & Compatibility

Ideal for road cyclists building power-based training plans, pacing climbs, monitoring intervals and riding on indoor trainers. Replaces the non-drive-side Shimano 105 FC-R7100 crank arm only; a complete crankset is not included. Select the crank length that matches your existing setup. Check the exact crank model and clearance between the sensor and frame before purchase. Connect to compatible ANT+ or Bluetooth Smart devices and apps. Apple Find My requires a compatible Apple device.

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.