The frame has a rear axle holder, a saddle holder socket (14) and a socket for the handlebars. The frame is made from a tubular section of cold-deformable material through the internal high pressure forming process. The frame can be formed at one end as a one-sided rear wheel suspension (12). The rear wheel suspension can be forked and made by cutting up the tube and bending the parts apart to form the fork. The frame could be formed at the rear end into a suitable closed Y-shape. The socket for the handlebars is pref. shaped as an integral piece and tapers up for easier dismantling.
