Abstract: The invention relates to an articulation device of a so-called steering column of a cycle, the said steering column consisting of at least one fork pivot and one handlebar tube, this steering column comprising two parts, a first part known as the upper part supporting the handlebar of a cycle and a second part known as the lower part supporting at least one front wheel. According to the invention, the said articulation device allows the steering column to be folded back along the chassis of the cycle at the same time as the front wheel is folded along the side of the cycle and allows the articulation to be locked so as to prevent both types of rotation.

Abstract: The invention relates to a motorcycle vehicle comprising a chassis which is open at its middle and supports at least one seat tube for supporting a saddle, on which chassis a pivoting arm supporting a rear wheel is mounted, about an axis of rotation, characterized in that the assembly consisting of the pivoting arm and the rear wheel is free to pivot towards the front of vehicle and towards the bottom of the vehicle about its axis of rotation so that it can be housed in the opening in the chassis. Advantageously, the seat tube is also articulated so that it can be rotated forwards and preferably allows the cycle to be locked in a folded position.