From $400, Amazon.com
The draw: Allows you to upgrade from single to dual leg
4iiii is not new to the power meter game, having been around a few years now—including two WorldTour pro cycling team power meter sponsorships. But this past fall, the company offered the option to go from a single-leg power meter (at $400), and then later upgrade to a complete dual left/right system (at $600). Accuracy looks very solid on the platform, and the flexibility to upgrade to a more detailed power meter down the road is ideal if you’re just getting into power.