Bar Fly 4 TT- Time Trial/Tri Mount (Includes Garmin, Polar, Wahoo, Mio, Magellan, GoPro, Light) Designed for Time Trial and Triathlon bikes - Bar Fly TT 4 will mount your computer, camera, light Mounts most popular computers and lights accessories - Garmin computer and watches, Polar, Wahoo, Mio, Magellan, Cateye, Joule, Bryton, GoPro, and most lights Geared for training and racing performance - improves field of vision by creating a heads up point of view , and wind tunnel tested to save you 7sec/40k Comes with GoPro/finned, light mount, and computer heads for: Garmin, Polar, Wahoo, Mio, Magellan, Powertap Joule, Cateye GPS, Bryton computer heads Accommodates a 22.2mm and 24mm bars (shim included)