Telescopic seatpost

A telescopic bicycle seatpost (10, 10′) for allowing a modification, while moving, of the height of a saddle (17) with respect to a seat tube of the frame of a bicycle as a function of pedaling needs, comprising a pair of telescopically-coupled tubular elements defined by a male tubular element (14, 14′) inserted into a seat tube of the bicycle frame, and by a female tubular element (15, 15′) coaxial to said male tubular element, a seatpost lock or head (16) arranged at one end of the female tubular element (15, 15′) on the opposite side with respect to that of coupling to the male tubular element (14, 14′), said seatpost characterized in that it comprises mechanical means for enabling/disabling an axial sliding movement of the female tubular element (15, 15′) with respect to the male tubular element (14, 14′) arranged on the seatpost itself and cooperating with shape and force coupling with means for locking in place the female tubular element (15, 15′) in order to define two or more height configurations of the saddle with respect to the seat tube of the frame, said mechanical means for enabling/disabling an axial sliding movement comprising an eccentric involute element (24′, 40′) rotationally arranged with respect to the female tubular element (15, 15′) and adapted to be engaged in pressure contact with one of at least two pockets (26, 41) formed and vertically mutually aligned along an outer side surface of the male tubular element (14, 14′), the distance “D” between an upper pocket and a lower pocket of said at least two pockets (26) corresponding to a maximum movement travel of the female tubular element (15) with respect to the male tubular element (14).