Feature●When paired with Rally RS100, the upgrade pedal completes the Rally power meter system, providing left/right balance data and cycling dynamics●The power sensor is even transferable to Rally XC pedals so you can have power for your off-road rides.●Revolutionary cycling dynamics display where you’re generating power throughout the pedal stroke and show left/right balance.Description Upgrade your Rally RS100 to a dual-sensing power meter, and analyze more than just watts to see exactly how your pedaling style generates the force that moves you.