Monitor your speed & cadence as you ride with these easy-to-install wireless sensors. With no magnets or other exposed parts to line up, these sensors are easy to install, maintain & move between bikes. The Speed Sensor 2 attaches to the hub of either wheel & self-calibrates with your Edge® cycling computer or compatible Garmin device to give you accurate speed & distance at all times — even without a head unit. The Cadence Sensor 2 fastens to any size crank arm & measures pedal strokes per minute so you can get the most out of your training. Send live speed, distance & cadence data to compatible training apps or displays by using ANT+® connectivity & Bluetooth® Low Energy technology. With both of these sensors on your bike, you can work to improve your personal best or see where you stand against the pros.