4iiii Precision 3+ Shimano 105 R7100 Non-Drive Side Power Meter (Black)

Description

The Precision 3+ gives you real power data without the cost or hassle of replacing a whole crankset — it ships pre-installed on a genuine Shimano 105 R7100 left crank arm, so fitting it is as simple as swapping your existing arm. A trio of strain gauges reads the changes in your pedal stroke output