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If you have access to the handlbars of your motorbike this could be the kit for you to mount you Samsung Galaxy S8+. This stong metal mounting attachment with 1" ball screws onto the handlebars of your motorcycle, with 1" ball and Ultimateaddons adapter plate it's ready to be connected to the One Holder, see all items included below.
Universal One Holder - (Included)Are you looking for a holder that fits the Samsung Galaxy S8+ and other similar sized phones? This one holder by Ultimateaddons will support Smartphones with dimensions of Width 50-80mm, Height 120-170mm and Depth 5-15mm.
25mm to 3 Prong Adapter - (Included)Ultimateaddons 3 prong socket plate is designed to allow Ultimateaddons® 3 Prong holders and cases to be connected.
Metal U-Bolt Handlebar Attachment - (Included) This kit is provided with 2 lengths of U-Bolt, making it versatile to work with a wider range of bars. The 1" ball is a universal size allowing connections to various mounts and adapter plates.1) 16-20mm U-Bolt Diameter2) 25-32mm U-Bolt DiameterExtender - (Optional)if you want more flexibility with the positioning of the Galaxy S8+ or if you want to add extra height ideal if you use a tank bag is select the 3" extender.