The 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..and includes the Arkon RoadVise (RV001WR-B) smartphone holder for mobile phones in a protective case.

Mount fits stems: 20.5mm - 24.5mm
The 1" Ball fixing.
Light weight - made from Aluminium.
Attaches easily to the steering head tube of fork stems.
Easy to fit and completely removable

The phone holder's solid construction provides strength and reliability on the road by securely gripping smartphones with protective cases weighing up to 900g (2lb) and measuring up tp 10cm (4 inches) wide. Spring loaded mechanism expands to contain your mobile device.
Designed and recommended for use with mobile phones in cases or skins. Suitable for use with tough, hard shell & ruggedised cases.
Low profile design ensures the rear camera is clear for spontaneous pictures or videos.

Mount offers extra reach & adjustment with a short arm (1.75 inch (4.45cm) between centres)

Always check that your stem cover can be removed leaving a central hole for the mount to fix in.
Simply drop the Fork Stem Motorcycle attachment into the hole of the stem and tighten. The split shaft will expand to fit the inside wall of the fork stem Use an Allen Key to tighten to create a tight fit.
NOTE: Measure your hole before ordering and check for steering dampening system.

The RoadVise cradle is suitable for mobile phones using a case up to 10cm (4 inches) wide - Apple iPhone 3GS, 4/4S, 5/5S/5C, 6 & 6 Plus. Samsung Galaxy S2, S3, S4, S5 & S6, Samsung Galaxy Note, Note 2, Note 3 & Note 4, HTC ONE series, Nokia Lumia & Motorola G / X

What's included? 1 x RoadVise phone holder, 1 x arm, 1 x adapter & 1 x stem mount.

Ultimate Addons Central Fork Stem Yoke Mount - YouTube

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