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.Included in the Box: BF 4 MAX comes with 7 Computer heads: Garmin, Polar, Wahoo, Mio, Joule, Cateye, Bryton, GoPro mount Base, Universal Light Mount, shim for 31.8 handlebars and Di2/EPS mount (optional Lezyne head available. Durable Construction – BF4 MAX out-front bike mount is created from advanced injection moulded co-polymer. This computer mount is strong enough to keep your electronics where you want them no matter how bumpy the road. Handlebar & Light Compatibility: BF4 MAX works with 35mm diameter bars and includes a shim for 31.8mm. A 12mm round clamping space on the left side of the stem is needed. Universal Light Mount can hold a flashlight of 1” diameter with silicone bands. Computer & Camera Compatibility: BF 4 Max bike mount includes replaceable heads for Garmin, Wahoo, Bryton, Cateye, Polar, Mio, Joule computers. GoPro base (3-fins) holds a GoPro camera or any camera or light with a GoPro (2-fins) adapter. Clean up your cockpit: 4 MAX out-front mount mounts up to 3 accessories (computer, camera or light and Di2/EPS junction box), out-front and center using minimal handlebar space. Compatible with large computers like Garmin 1000 series and Wahoo Elemnt/Roam.