Telescopic suspension device fitted with a pretension tracking system

A telescopic suspension device configured to be attached to the hub of a wheel comprising a first tube, a second tube configured to slide relative to the first tube and a main spring arranged inside said first and second tubes, and further comprising a pretension adjustment stopper of the main spring installed at an upper end of said first tube, wherein the pretension adjustment stopper of the main spring comprises a pretension tracking system of the main spring configured to convey information representative of the weight of the user, wherein said pretension adjustment stopper comprises a body fixed to the upper end of the first tube, wherein said body houses a plunger threaded externally and screwed into a tapped inner portion of the body, wherein said plunger is supported against one end of the main spring, and wherein an actuation button is rotatably mounted at an end of the body and rotatably coupled to said plunger by a sliding arrangement having a longitudinal groove and a longitudinal rib.