PRECISION 3+ Ride Ready GRX FC-RX810/RX820 Power Meter Left Arm

The 4iiii PRECISION 3+ Ride Ready is a left-arm power meter pre-installed on a Shimano GRX crank arm, compatible with both the FC-RX810 (11-speed) and FC-RX820 (12-speed) gravel drivetrains. It delivers ±1% power accuracy and includes Apple Find My support for keeping track of the unit across long days in the dirt.

The meter ships in a smaller and lighter form factor than its predecessor, with an automatic terrain selector that adjusts calibration across varied riding conditions. Battery life reaches up to 800 hours, reducing time spent on maintenance, and every unit is backed by a 3-year warranty.

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