Is the Speed Sensor waterproof? Phil May 20, 2019 22:08 Updated Yes! The Speed Sensor carries a 1ATM water rating and can handle anything you might experience on a bike ride. More details can be found here: https://www.garmin.com/en-US/legal/waterrating Related articles Can I purchase an additional Speed Sensor? How long does the Speed Sensor battery last? I'm unable to connect a Speed Sensor with the Cannondale app How to verify the Wheel Sensor is connecting with the Cannondale App and speed is correct? What does “Last sync” mean on my Activity Log?