PRECISION 3+ Ride Ready Ultegra FC-R8100 Factory Second Power Meter Left Arm

The 4iiii PRECISION 3+ Ride Ready Ultegra FC-R8100 Factory Second Power Meter (Left Arm) delivers pro-level accuracy in a lighter, more compact design, now with Apple Find My support. Trusted by elite racers and dedicated riders alike, it provides reliable, precise data whether you’re training indoors, chasing a Kona qualification, or pushing for a new local KOM.

Featuring ±1% accuracy, automatic terrain selection, and up to 800 hours of battery life, PRECISION 3+ removes guesswork from every ride. Each unit is backed by 4iiii’s industry-leading 3-year warranty for long-term confidence.

This Ride Ready Factory Second crankset pairs a lightly used Shimano Ultegra FC-R8100 left crank arm with a brand-new 4iiii PRECISION 3+ powermeter. Every crank undergoes a strict inspection and professional cleaning before installation by 4iiii technicians to ensure it meets exacting performance and quality standards. Despite minor cosmetic signs of use, performance and reliability remain uncompromised and the full 3-year warranty still applies.