The Shimano Ultegra R8100 4iiii Power Meter transforms the left crank into a precise, dependable training tool for riders focused on measurable performance.
Key Features:
- 4iiii patented 3D measurement technology delivers consistent power data while riding.
- ±1% accuracy provides precise wattage readings for structured training and performance tracking.
- 0–4000 W power range covers everything from endurance riding to high-intensity efforts.
- 30–170 rpm cadence range provides real-time pedaling data alongside power output.
- Up to 800 hours of battery life supports extended training between battery changes.
- CR2032 coin-cell battery makes power meter maintenance straightforward.
- ANT+ and Bluetooth connectivity works with compatible cycling computers, trainers, and devices.
- LED status indicator provides a quick visual check of the power meter.
- IPX7 waterproof rating helps protect the unit during wet riding conditions.
- 5.5 mm height keeps the power meter profile compact on the left crank.
- Compatible with Apple Find My, Zwift, TrainerRoad, SYSTM, and other supported platforms.
- Operating temperature range of 0–50°C supports use across varied riding environments.
Who is it for?
For road cyclists, triathletes, and performance-focused riders who want accurate power and cadence data for training, racing, and indoor workouts.
Specifications may differ from the photo and are subject to change without prior notice.
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