Garmin 2 speed sensor

Effortlessly monitor your speed and distance with the Garmin Speed Sensor 2. This easy-to-install wireless sensor attaches to the hub of either wheel—no magnets or tricky parts to line up. Move it between bikes in seconds! It self-calibrates to provide accurate speed and distance at all times, even without a head unit. ANT+® and Bluetooth® connectivity lets you sync data to Garmin Connect, training apps, and fitness equipment for detailed analysis of your indoor and outdoor rides. The built-in odometer even tracks your total distance to help plan for bicycle maintenance