4iiii PRECISION 3+ Ride Ready Ultegra FC-R8100 Power Meter Left ArmThe 4iiii PRECISION 3+ Ride Ready is a left arm power meter pre installed on a Shimano Ultegra FC R8100 crank arm, ready to mount and ride without additional setup. It delivers 1% power accuracy and includes Apple Find My support, allowing riders to locate the unit if it goes missing. The meter ships in a smaller and lighter form factor than its predecessor, with an automatic terrain selector that adjusts calibration for varied riding conditions.