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? Which Speed Sensor adapter do I need for my wheel? I'm unable to connect a Speed Sensor with the Cannondale app The sensor is not finding my bike How do I enter my height and weight in the Cannondale app on iPhone?