4iiii
The 4iiii Precision 3+ left crank power sensor delivers reliable road power data for Shimano 105 FC‑R7000 bikes. It features Bluetooth transmission, a CR2032 battery lasting up to 800 hours, Apple Find My tracking, and +/-1% accuracy, all in a compact crank‑arm design.
Checked Jul 16, 2026 14:41
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Product details
The 4iiii Precision 3+ left crank power sensor is built for road cyclists using Shimano 105 FC‑R7000 cranksets. It measures power from the left crank arm and transmits data via Bluetooth to compatible head units or computers. Powered by a CR2032 battery, it offers up to 800 hours of operation before replacement. The sensor includes Apple Find My integration, allowing riders to locate the unit through iOS devices. With a claimed accuracy of plus or minus one percent, it provides consistent data for training and racing. Installation follows the standard Shimano crank arm mounting procedure, and the device is covered by a three‑year warranty. Designed for road use, the Precision 3+ combines a lightweight package with reliable performance, making it suitable for both competitive and recreational riders.
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