Positioning device for a telescopic seat post of a bicycle frame including: - a tubular telescoping element having a longitudinal axis and a latching means which is situated on an inside surface of the telescoping element, - a tubular supporting element which is displaceably mounted in the telescoping element so as to be non-rotatable, - at least one locking device having at least one latching element which is movable into engagement with the latching means, wherein the latching means comprises radial grooves which are arranged in the inside surface of the telescoping element and are delimited in the circumferential direction, wherein the at least one latching element is actuatable by at least one actuator, wherein at least one redirecting means redirects the movement of the actuator along the longitudinal axis into a movement transversely with respect to the longitudinal axis and transmits the movement to the at least one latching element - which is in contact with the redirecting means - and, as a result, the at least one latching element is movable in the direction radially with respect to the longitudinal axis into contact or out of contact with the latching means, wherein a rod extends through the positioning device along the longitudinal axis, wherein the rod is connected to an energy store, characterized in that a rod locking means, which is movable into engagement with the latching means, is arranged on the rod, wherein the rod locking means is movable into engagement with the latching means as a result of a rotation about the longitudinal axis and blocks the position of the rod relative to the telescoping element along the longitudinal axis. - a tubular telescoping element having a longitudinal axis and a latching means which is situated on an inside surface of the telescoping element, - a tubular supporting element which is displaceably mounted in the telescoping element so as to be non-rotatable, - at least one locking device having at least one latching element which is movable into engagement with the latching means, wherein the latching means comprises radial grooves which are arranged in the inside surface of the telescoping element and are delimited in the circumferential direction, wherein the at least one latching element is actuatable by at least one actuator, wherein at least one redirecting means redirects the movement of the actuator along the longitudinal axis into a movement transversely with respect to the longitudinal axis and transmits the movement to the at least one latching element - which is in contact with the redirecting means - and, as a result, the at least one latching element is movable in the direction radially with respect to the longitudinal axis into contact or out of contact with the latching means, wherein a rod extends through the positioning device along the longitudinal axis, wherein the rod is connected to an energy store, characterized in that a rod locking means, which is movable into engagement with the latching means, is arranged on the rod, wherein the rod locking means is movable into engagement with the latching means as a result of a rotation about the longitudinal axis and blocks the position of the rod relative to the telescoping element along the longitudinal axis.