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 .