http://www.militarybikes.com The Paratrooper™ folding bike is full size, 24 speed mountain bike designed to endure any terrain at high speed in silence with no heat signature. In addition to the high performance feature, the bike folds simply without the use of tools.

By turning one quick lever, the Paratrooper™ folds in less than 30 seconds into 3' x 3' pack that can be dropped from a plane, strapped to the side of an LAV or thrown in the back of a trunk. (less info)