The inventive device includes a tricycle frame comprising a front wheel
steering mechanism, the left and right trailing arms with folding
mechanism, the left and right rear wheel brake systems, and a cambering
mechanism. The improvements have been made to the construction and
operation of cambering mechanism, the trailing arm folding and locking
mechanism and the handlebar. It provides better maneuverability and
stability during cambering maneuver, easier operation of folding, and
quick assembly and disassembly of a one-piece handlebar. This is achieved
through an original cambering mechanism with a rocking-bar connecting
spherical bearings and a polymer energy-storing element, and an original,
easy to operate and anti-disengagement sleeve-type folding mechanism, and
a one-piece steering handlebar with quick handlebar locking mechanism.