4iii Precision 3+ 105 7100 Left Arm Power Meter 

If you’re serious about getting faster, training smarter, and making every ride count, a power meter isn’t a luxury, it’s a necessity. The PRECISION 3+ delivers pro-level performance with +/-1% accuracy, giving you data you can trust whether you’re climbing alpine passes, sprinting at high cadence, racing on Zwift, or grinding through gravel. Its ultra-light 9 g design means you’ll never feel it, yet it’s powerful enough to measure up to 4,000 watts. With automatic terrain selection, left/right balance metrics, and seamless ANT+ and Bluetooth connectivity, you get the same quality insights relied on by elite athletes, without the elite price tag.

Built for real-world riding, the PRECISION 3+ features an industry-leading 800-hour battery life, IPX7 waterproof protection, and the added security of Apple Find My integration to help you keep track of your bike. It comes Ride Ready on a brand-new Shimano crank arm, so installation is as simple as swapping your left crank and heading out the door. Backed by a 3-year warranty and including 8 weeks of FREE premium training on the JOIN Cycling App, this isn’t just a power meter, it’s your complete performance upgrade. 

Check Bike Frame Compatibility for the 4iiii PRECISION Power Meter