Three strain gauges measure forces across your entire pedal stroke rather than estimating from a single point. 4iiii is the only crank-based power meter manufacturer using this approach, which matters because your legs apply force in multiple directions as you push through the crank rotation. Capturing those vectors gives you accurate watt readings regardless of whether you're mashing up a climb or spinning on flat roads. The system holds plus or minus one percent accuracy, which means the number on your head unit reflects actual power output rather than an approximation.

Each crank arm carries its own power meter pod, so the system tracks left and right leg independently before combining them into total output. This gives you left-right balance data that shows whether one leg is doing more work, which helps identify strength imbalances you can address through specific training. The pods also calculate pedal smoothness and torque effectiveness, which tell you how consistently you apply force through the full pedal circle rather than just mashing down at the top.

The automatic terrain selector adjusts cadence and power feedback based on whether you're riding smooth pavement or rough surfaces. When you hit gravel or chip seal, the system adapts to deliver responsive data without the lag you'd get from a single detection mode. Battery life runs up to five hundred fifty hours on the standard CR2032 coin cells, which means you can ride for months before swapping batteries.... Read More