Monitor your pedalling cadence as you ride with this easy-to-install wireless sensor. With no magnets or other exposed parts to line up, this sensor is easy to install, maintain and move between bikes. The Cadence Sensor 2 fastens to any size crank arm and measures pedal strokes per minute so you can get the most out of your training. ANT+® connectivity and Bluetooth® Low Energy technology let you send cadence data to our Garmin Connect™ online community and other training apps, compatible devices and fitness equipment for better data when you ride indoors and outdoors.