Open the door.
By splitting its complete power meter system into multiple, free-standing pieces, Pioneer essentially provided a gateway to get into the watts-measuring game gradually rather than dropping over $1,000 at once. The Right Side Power Upgrade Kit is actually just a box that, if you drop your drivetrain crank arm and chainrings in and ship it off to Pioneer, transforms your mundane crankset into a power meter-equipped data monster. Of course, the process isn't magical or mysterious at all. It's simple. While Pioneer has your drive-side crank arm, it will install a power meter sensor to it, and the only labor you need to worry about is re-installing the crank.
The Right Side Power Upgrade Kit is perfectly capable of functioning as a stand-alone power meter; however, when combined with Pioneer's non-drive-side power meter, it opens the door for more accurate measurements by logging numbers for both legs rather than just doubling the readings recorded through a single crank arm. While the Single Leg system works well, the Dual Leg model takes your numbers and training to the next level.