4iiii
4iiii PRECISION 3+ Shimano GRX RX810/RX820
Gravel-focused Shimano GRX left-sided power measurement with ±1% accuracy and long battery life.
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Key Benefits
- Gravel Training Insight — Track watts and cadence across variable terrain.
- Consistent Power Data — ±1% claimed accuracy.
- Long Running Time — Up to 800 hours per CR2032 battery.
- Low-Profile Design — Approximately 9 g added to the crank arm.
- ANT+ and Bluetooth — Connect to compatible computers and training apps.
- Wet-Weather Durability — IPX7-rated sensor housing.
The 4iiii PRECISION 3 power meter for Shimano GRX brings consistent power and cadence data to gravel riding. Built onto a replacement GRX left crank arm, it gives cyclists a useful measure of effort across rolling terrain, headwinds and longer endurance events.
The non-drive-side sensor offers ±1% claimed accuracy, ANT+ and Bluetooth Smart communication and up to 800 hours of battery life from a replaceable CR2032 cell. With low additional weight and IPX7 water resistance, it is designed to cope with the demands of gravel training.
Select the matching crank length and confirm the exact GRX crankset model and clearance. GRX uses a different stance width from Shimano road groupsets, so a road replacement crank should not be substituted. For Apple Find My functionality, please check whether the supplied meter is a compatible PRECISION 3+ version.
