I've only seen Canyon bikes implement a USB port on the top tube for charging peripherals. I use my iPhone as a nav device and I wish my eOne Sixty had this option!
Made from an inner tube, zip ties and a bit of foam.
Works well even off road on gnarrr fest singletrack. Anyway worked for me :cool:
Not my bike, who would have two bells ;-)
There is singletrack there ;-)
Up close.
More pix. Instructions if I get around to it :)...