Gray bicycle crankset with chainring on a white background

4iiii

4iiii Factory Install Precision 3+ DUAL PRO

~~£659.00~~ £569.00 Sale

Pro-grade ±1% accuracy and seamless factory installation — elite performance data straight from your pedals.

Crankset Model: Shimano Ultegra FC-R8100

Shimano Ultegra FC-R8100 Shimano Dura-Ace FC-R9200

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Expected 7-10 Days Delivery Free UK delivery over £50

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30-day returnsView policy

Key Benefits

Dual-Sided Factory Fit — 4iiii installs power meter sensors on both arms of your compatible crankset.
±1% Accuracy — Dependable power data for training and racing.
Left/Right Balance — Compare each leg's contribution to your total power.
Pedalling Insights — Track smoothness and torque effectiveness on supported devices.
Wireless Integration — ANT+ and Bluetooth Smart connectivity.
Up to 550 Hours — Long-lasting performance from a CR2032 battery.
Apple Find My — Locate your power meter with compatible Apple devices.
Automatic Terrain Selector — Adapts cadence and power measurement to riding conditions.

Upgrade your existing compatible crankset with the 4iiii PRECISION 3+ PRO Factory Install Power Meter. This dual-sided system measures power from both legs with ±1% accuracy, along with left/right balance, pedal smoothness and torque effectiveness.

Built for training and racing, it connects to compatible devices through ANT+ and Bluetooth Smart. Apple Find My integration, IPX7 water resistance, automatic terrain selection and up to 550 hours of battery life make it a dependable performance upgrade.

Please note: This is a factory-install service, not a complete crankset. You supply your existing Shimano Ultegra FC-R8100 or Shimano Dura-Ace FC-R9200 crankset. Select your crankset model above. Installation is subject to an approved frame-clearance check.

How the Factory Install Service Works

Place your order and select your crankset model.
Send a frame-clearance photograph to team@northsports.co.uk, quoting your North Sports order number. Contact us if you need guidance on the photograph.
We arrange approval. North Sports submits the order details and photograph to our distributor for clearance review.
Wait for shipping instructions. Once clearance is approved, we will forward the instructions for sending your crankset. Do not send your crankset before receiving these instructions.
Factory fitting and return. The power meter is fitted to your supplied crankset and returned following installation.

Frequently Asked Questions

Is a new crankset included?

No. The price covers the dual-sided power meter factory-install service for your own compatible crankset.

Which cranksets can I send?

For this service through North Sports, only Shimano Ultegra FC-R8100 and Shimano Dura-Ace FC-R9200 are supported. Frame clearance must also be approved.

How long does the process take?

Timing depends on the clearance review, shipping to the installer, factory fitting and return shipping. Please contact North Sports for the current turnaround before ordering.

Technical Specifications

Product: 4iiii PRECISION 3+ PRO Dual-Sided Power Meter – Factory Install
Measurement: Dual-sided crank-based power; sensors fitted to both crank arms
Accuracy: ±1%
Cycling metrics: Power, cadence, left/right balance, pedal smoothness and torque effectiveness
Wireless connectivity: ANT+ and Bluetooth Smart
Battery: CR2032 coin cell; up to 550 hours
Cadence range: 30–170 rpm
Power range: 0–4,000 W
Pod profile: 5.5 mm
Weight: 29 g (manufacturer specification)
Water resistance: IPX7
Automatic terrain selector: Yes
Apple Find My: Yes, requires a compatible Apple device
Operating temperature: 0–50°C
Storage temperature: −40–60°C
Pinpoint-supported cranksets: Shimano Ultegra FC-R8100 and Shimano Dura-Ace FC-R9200 only. Frame clearance must be confirmed before installation.
Installation: Factory fit onto the customer's eligible crankset, following a clearance check
Warranty: 3 years

Suggested Use & Compatibility

What You Are Buying

This is the 4iiii PRECISION 3+ PRO dual-sided factory-install service. You supply your existing eligible crankset; a new crankset is not included. 4iiii installs power meter pods on both crank arms and returns your crankset after fitting.

Crank Model & Clearance Check

Choose the exact crankset model from the selector above. For the Pinpoint-supplied service, only Shimano Ultegra FC-R8100 and Shimano Dura-Ace FC-R9200 are supported. Before the crankset can be sent for fitting, frame clearance must be approved from a clear photograph showing the space between crank and frame.

How to Arrange Your Factory Installation

After placing your order, email the frame-clearance photograph to team@northsports.co.uk and quote your North Sports order number. Contact us if you need guidance on taking the photograph. North Sports submits the details and photograph to Pinpoint for approval. Once the clearance check is approved, we will forward the crankset shipping instructions to you. Do not send your crankset before receiving those instructions. Please contact North Sports for the current total turnaround, including transit and fitting.

Training & Connectivity

Connect to compatible cycling head units, sports watches or indoor-training software through ANT+ or Bluetooth Smart. Supported devices and apps can display power, cadence, left/right balance, pedal smoothness and torque effectiveness. Apple Find My works with compatible Apple devices.

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.