Rolling with a computer can provide valuable data on routes, elevations, and your progress, but without a proper speed sensor its hard to really get a grasp on just how much faster you're getting. Strap the Stages Dash Speed Sensor to your hub for a boost in data, easily transmitting your speed to your head unit, so you can work on getting faster in a nick of time. The sensor itself isn't much larger than a quarter, and weighs in at only 8-grams, so it won't put a damper on your weight savings. It secures to your hub with included mounting hardware and can be removed and swapped to another bike quickly for ease of use. It transmits data over Bluetooth, quickly sending data to your head unit, or smart phone, and uses a Coincel battery that lasts for 600-hours of ride time.