Upgrade your Rally XC100 to a dual-sensing power meter, & analyze more than just watts to see exactly how your pedaling style generates the force that moves you. When paired with Rally XC100, the upgrade pedal completes the Rally power meter system, providing left/right balance data & cycling dynamics. The power sensor is even transferable to Rally RS & RK pedals so you can have power wherever you ride. Revolutionary cycling dynamics display where you’re generating power throughout the pedal stroke & show left/right balance. See where you apply force on the pedal to ensure proper cleat position & track seated vs. standing to see how position changes efficiency. Compatible Devices: Rally XC100