An improved saddle for bicycles includes a device for coupling the saddle to a saddle sleeve to be coupled to the bicycle framework and comprising a saddle frame, defining an elongated central body, having an open slot, lying in a plane substantially perpendicular to the saddle sleeve, the central body being encompassed by an open bushing engageable with the arms of a fork coupled to the saddle sleeve, the bushing being adapted to be clamped by a locking pin passing through the open slot.