Garmin Bike Cadence Sensor Easy-to-install - Simply attach the sensors and ride. With no magnets or other exposed parts to line up, these sensors are easy to install, maintain and move between bikes. Cadence sensor - Fastens to any crank arm size and measures pedal strokes per minute so you can get the most out of your training. Cadence sensor - Fastens to any crank arm size and measures pedal strokes per minute so you can get the most out of your training. Includes: Cadence sensor, Cadence sensor straps, manual