GoPro Ride Hero Clamp (Handlebar Seatpost Mount)
This clamp set allows you to attach your GoPro camera to bike frame tubes (such as handlebars and seatposts). All diameters between 0.75" and 1.4" (1.9cm - 3.5cm) are suitable.
The mount's 3-way pivot adjustment is also quick and easy, allowing the camera to be mounted at all sorts of angles.