Buybits Sports Bike Motorcycle Mount for Fork Stem Yoke 17.5mm-20.5mm with Waterproof GPS Case fits TomTom ONE SatNav Systems (SKU 10322) Motorcycle Fork Stem Yoke Mount Fits Stems: 17.5mm - 20.5mm (0.68"-0.81"). This central fork stem yoke mount has been developed for use on motorcycles where a handlebar mounting option is not possible or desirable. This waterproof bike mount has been designed to fit sports, superbike, endurance and touring motorbikes using the cylindrical bore wall (steering head tube) of the fork stems. All weather case fits TomTom GO 520, 720, 720, GO 530, 730, 930, GO Live 540, 740, 940, GO Live 550, 750, 950, GO LIVE 1000 / 1005 & TomTom ONE v1, v2, v3, v4 with easy-port & v5 IQ Routes, the TomTom ONE XL v1, XL v2, XL IQ Routes, XL Live. Charging cable access. Clear touch screen. Security screw. Case unclips for storage.