4iiii
4iiii PRECISION 3+ Shimano Ultegra R8100
Ultegra FC-R8100 left-sided power meter with ±1% accuracy, an ultra-low-profile sensor and up to 800 hours of battery life.
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Key Benefits
- Power-Based Training — Monitor watts to manage intervals, climbing and pacing.
- High Accuracy — ±1% claimed accuracy for consistent performance tracking.
- Lightweight Upgrade — Sensor adds approximately 9 g to the crank arm.
- Broad Connectivity — ANT+ and Bluetooth Smart for compatible devices and apps.
- Extended Battery Life — Up to 800 hours with a CR2032 cell.
- Apple Find My — Location support on compatible Apple devices.
Add precise power measurement to a compatible Shimano Ultegra FC-R8100 road bike with the 4iiii PRECISION 3.0+ left-side power meter. The sensor is built onto a replacement left crank arm, giving riders a lightweight way to monitor watts and cadence during training or racing.
With ±1% claimed accuracy, ANT+ and Bluetooth Smart connectivity and a replaceable CR2032 battery lasting up to 800 hours, the system works across outdoor rides and supported indoor training platforms. Its slim 5.5 mm profile and IPX7 water resistance are designed for everyday riding conditions.
Apple Find My adds a useful location feature for compatible Apple users. Choose the correct crank length and confirm frame clearance before ordering to ensure a suitable installation.
