Keep track of your pedal strokes with the Bike Cadence Sensor from Garmin. No magnets required! This is Garmin's newest cadence sensor...and it's totally awesome! Simply attach the sensor and ride...it's that easy. No magnets, and no exposed parts to line up. Just attach the cadence sensor to any size crank arm and it measures pedal strokes per minute. It self-calibrates with your Garmin ANT+ compatible device to give you accurate cadence at all times...including on indoor trainers. Train hard, ride fast, and win races with the Garmin Bike Cadence Sensor.