This version of The Beebe Company's popular universal phone mount will securely hold any phone (even iPhone X or Galaxy Note) with any case to the handlebars or stem of your bicycle or motorcycle - and it will fit in tiny spaces on the handlebars between levers, clamps, and grips.
It simplifies listening to music or using maps, and allows you to add modern navigation to an old or retro bike. It's light weight, extremely quick to attach or remove, and just gets better with age. It also folds up to a thin profile that is comfortable in a back pocket.
The Hawthorne version has been fine-tuned to fit bicycle stems and tight sections of handlebars down to only 1.75" wide (<5.5inches or 14cm circumference). The main body piece measures 2" x 7.75". The leather conforms automatically to curved uneven areas, and the strap forms a stable flat surface for your phone.
Two custom-molded silicone bands will stretch to fit very snugly and securely around any smartphone, with any case! But another advantage of silicone is that it won't dry out, crack or lose its stretch like rubber. Grippy silicone webbing on the back keeps the holder from slipping. A solid brass or nickel Chicago screw that holds down the strap also makes it easy to swap out the silicone bands if one ever needs replacement.
Sizing tip: It's important to choose the version that allows the leather to overlap itself and cover the screw that makes the bands replaceable.