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.