1.size device for the construction of bespoke bicycles, which is based on what is considered the frame of a bicycle, essentially characterized by both the horizontal bar that joins the saddle with the handlebar, and the vertical bar that joins the saddle with the pedals, are adjustable in length, in such a way that both bars are constituted by a pair of telescopic tubes, the exterior of which has a long longitudinal groove through which a cursor emerges as a signaling element on a scale graduated on the sides of the respective groove of each of the aforementioned external tubular elements, with the particularity that the displacement in either direction of such telescopic tubes is carried out by means of an internal rack that is externally actuated by a steering wheel, having provided that the telescopic tubes are clamped together to prevent the displacement of a or on another, it is carried out by means of an external lever associated with a clamp spout provided with means so that, by means of said actuation of the lever, they squeeze one tube against the other preventing their accidental or involuntary displacement. (Machine-translation by Google Translate, not legally binding)
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