Easily mountable wireless sensors allow you to track your cadence and/or speed during your ride. Simply attach the sensors and get started. There's no need to align magnets or other parts. The sensors can be mounted in no time and are easy to maintain. They can be used effortlessly on different bicycles. The cadence sensor is suitable for crank arms of all sizes and measures pedal revolutions per minute, helping you get the most out of your training. The speed sensor is mounted on one of the wheel hubs. It performs self-calibration with the Edge and consistently provides accurate speed and distance data—even when training on a turbo trainer. Use both sensors to improve your personal bests or see how you stack up against the pros.