Monitor your ride with these easy-to-install, wireless speed and cadence sensors. With no magnets or other exposed parts for alignment, these sensors are easy to install, store and move from bike to bike. The second-generation Speed ​​Sensor attaches to the hub of one of your wheels and automatically calibrates via your Edge® cycling computer or compatible Garmin device to give you accurate speed and distance data at all times. The sensor stores your ride data even without Edge or a compatible device; once connected, the data is shared between the two devices. The Cadence Sensor attaches to any size crankarm and measures pedal strokes per minute.