The 4iiii PRECISION 3+ Factory Second pairs a brand-new PRECISION 3+ power meter with a lightly used Shimano Ultegra FC-R8100 left crank arm, inspected and cleaned by 4iiii technicians before installation. Minor cosmetic signs of use may be present, but performance is uncompromised, with ±1% accuracy and Apple Find My support included.

The meter features a smaller, lighter form factor than its predecessor, with automatic terrain selection that adapts calibration across different riding conditions. Battery life reaches up to 800 hours between charges, and the full 3-year warranty applies to every unit regardless of Factory Second status.

Quick Facts

Feature	Specification
Compatibility	Shimano Ultegra FC-R8100, 12-Speed
Condition	Factory Second (minor cosmetic signs of use)
Accuracy	±1%
Battery Life	Up to 800 hours
Apple Find My	Supported
Warranty	3 years (full coverage)