The Bar Fly 4 MAX is an “out-front” mount made specifically for large cycling computers. The modular system mounts your computer, Di2/EPS junction box, and a GoPro or Light mount to your bike. It is compatible with 31.8mm and 35.0mm handlebars. BF4 MAX holds your computer out front and center for optimal viewing and aerodynamics. Its reach is long enough for large computers (Garmin 1000 series, Wahoo Elemnt / Roam). In addition, it will hold a light or camera compatible with included GoPro base, and a Di2 / EPS Junction Box. Even smaller computers can fit, but they will not be close to the handlebar. Included GoPro base holds light or camera with compatible adapter. BF4 MAX is constructed from an advanced injection moulded co-polymer that is strong and weatherproof. It can accommodate up to three accessories at one time: a computer, light, and Di2/EPS Junction box. The computer mount is compatible with Garmin Edge Series 200, 500, 510, 520, 800, 1000 - Watches 910XT, 920XT - all Wahoo - Polar M450 - Bryton 100, 300, 310, 330, 530, 10 - One Cateye. Use this outfront bike mount as a Wahoo mount or a Garmin mount. This bike mount is compatible with Garmin Edge Series 200, 500, 510, 520, 800, 810, 1000, Touring Watches 910XT, 920XT, Polar M450, V650, all Wahoo, Mio 500, 505, 505HC, Magellan 315, 505, Powertap Joule, Cateye GPS/Wireless, Bryton 100, 300, 310, 330, 530, 10 and One, Hammerhead Karoo (Garmin head). Some bike light companies include a GoPro adapter, others offer it as an option. Hammerhead computers fit Garmin head. Newer Pioneer computers fit Wahoo head. Included in the box: BF4 Max composite mount with hardware, 7 Computer heads: Garmin, Polar, Wahoo, Mio, Joule, Cateye, Bryton, GoPro Base, Universal Light Mount, shim for 31.8 handlebars and a Di2/EPS mount. BF4 MAX also includes a Junction Box mount if you have electronic shifting. The mount replaces the clamp nut and holds the Box with 2 silicone bands. This accessory is independent of the computer and GoPro adapters.