Buybits 15mm-17mm Motorcycle Bike Fork Stem Yoke Mount use with TomTom Rider 2 (sku 10323) Now we can offer you an alternative mounting option for your bike SatNav. Suitable for the TomTom Rider 2, the Urban Rider and the Rider PRO and the Garmin Zumo 220, 400, 500, 550 & 660. This mount uses the 1" (25mm) ball fitting used by many motorcycle mount manufactures including RAM Mounts & SW-Motech. Motorcycle Fork Stem Yoke Mount Fits Stems: 15mm - 17mm (0.59"-0.68") This central fork stem yoke mount has been developed for use on motorcycles where a handlebar mounting option is not possible or desirable. Designed to fit sports, superbike, endurance and touring motorbikes using the cylindrical bore wall (steering head tube) of the fork stems. Note that this is a mount attachment for and not a complete mounting solution