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4iiii Power Meters

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Power Measurement
Left vs. Right Side Power
Crank Arm Material
Spindle Diameter
Battery Type
Calibration
Warranty

4iiii power meters are a top choice for cyclists across road, gravel and mountain biking disciplines, especially those already using Shimano cranksets. These power meters stand out for their affordable pricing, easy installation, lightweight design and accuracy. Whether you’re looking for a left side crank arm or a complete dual-sided crankset, 4iiii has options to suit your needs. Their latest PRECISION 3+ models feature an exceptional 800-hour battery life. They also have built-in Apple Find My support, making them some of the most practical and value-packed power meters available today.

Additional 4iiii Power Meter Info:

Installing a 4iiii crank arm is quick and straightforward. Just replace your existing arm with the power-equipped version, typically in under five minutes. Full crankset installations require a bit more time and compatibility checks, but are still simple with basic tools. At just 9 grams of added weight, 4iiii’s sensors are among the lightest on the market. Left side units measure power from one leg and double the value, while dual-sided cranksets offer true left/right measurement and balance metrics.

All 4iiii models transmit data via ANT+ and Bluetooth SMART. This ensures wide compatibility with bike computers and mobile apps. Accuracy is excellent, with all units rated to within ±1.0% and cadence is measured using a built-in accelerometer. The PRECISION line uses CR2032 coin cell batteries which are easy to find and replace. The new PRECISION 3+ offers a massive 800 hours of battery life. Backed by a three-year warranty, 4iiii power meters deliver a solid combination of reliability, longevity and modern features that appeal to both new and experienced riders.

Please see our 4iiii FAQ for more information on 4iiii power meters.

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