Speed Sensor 2 and Cadence Sensor 2 for Bike | GARMIN

Monitor your speed and cadence during your bike rides with these easy-to-install wireless sensors. With no magnets or other parts to install, these sensors are incredibly simple to attach and maintain. You can also easily move them from one bike to another.
The Speed Sensor 2 attaches to the hub of either wheel, and you can initiate its auto-calibration on your Edge® bike computer or compatible Garmin device to receive accurate speed and distance data at all times, even without a head unit.
The Cadence Sensor 2 attaches to crank arms of any size and counts pedal strokes per minute for highly effective training.
Send real-time speed, distance, and cadence data to training apps or compatible displays using ANT+® connectivity and Bluetooth® Low Energy technology.

With these two sensors, you can beat your personal best or compare your performance to that of professionals.