The Garmin Bike Speed Sensor provides you with an accurate speed reading that you can monitor through your Garmin Edge. Simply to attach the Garmin Bike Sensor attached to hub of either your front, or rear wheel, giving you an accurate reading of your speed & distance. Providing you have a un interrupted GPS signal you can use the Bike speed sensor doors with your turbo trainer, great for your winter training regime. Description by Emma, Rutland Cycling Web Team.