The Upgrade Pedal is an accessory that converts the Garmin Rally XC 100 single-sided power meter into a dual-sided power meter pedal system that can analyse more power values than just watts. When the upgrade pedal is paired with the Rally XC100 (power meter with sensor), you get a complete rally wattmeter pedal system that provides values for right/left distribution and cycling dynamics, and learns exactly in which area of the 360° pedal cycle you get the best performance.