Amazon.com: BRCOVAN Motorcycle Fork Stem Phone Mount Holder with Amazon.com: BRCOVAN Motorcycle Fork Stem Phone Mount with Vibration Quad Lock Motorcycle Fork Stem Mount Pro FREE UK DELIVERY Amazon.com: BRCOVAN Motorcycle Fork Stem Phone Mount with Vibration Amazon.com: BRCOVAN Metal Anti Theft Motorcycle Fork Stem Phone Mount. 17. 5 20. 5mm Motorcycle Fork Stem Mount & Strong Grip Holder for iPhone 12 Pro Cradle Clamping Dimensions: Cradle will hold phones up to 3. 9 inches wide Lipped grip means phone will stay secure in the holder. The redesigned cradle offers even greater support for larger phones in bumpy conditions. Mount; This central fork stem yoke mount has been developed for use on bikes 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. Mount Fits Stems: 17. 5mm 20. 5mm (0. 68 inch 0. 81 inch)Light weight made from Aluminium. Attaches easily to the steering head tube of fork stems. Easy to fit and completely removable.