While your Edge 800 or Edge 500 GPS comes with two of these Quarter Turn Bike Mounts, what if you lose one and like to ride with your Garmin GPS on more than one bike -- perhaps on your road and mountain bikes Luckily you can purchase them separately here. The Garmin Quarter Turn Bike Mount secures quickly and easily to your stem or handlebars without tools, using sturdy O-rings. You'll get four O-rings -- two of each size -- so you can install the mount on any size handlebars and stems -- wing shaped, round or oval. Once installed, you be able to move your Garmin Edge 800 from bike to bike with ease, and with the simplicity of the mount, you'll be ready to ride in 30 seconds or less.