Height adjustable seatpost assembly

A seatpost assembly comprising:

• a first seatpost portion;
• a second seatpost portion that is axially displaceable relative to said first seatpost portion along an axial axis in a retracting direction of increasing axial overlap with said first seatpost portion to a retracted position and in an axially extending direction of decreasing axial overlap with said first seatpost portion to an extended position thereof;
• an engagement element including a coil portion thereof positioned to extend generally circumferentially around at least one of said first seatpost portion and said second seatpost portion, including a first termination of said coil portion and a second termination of said coil portion;
• wherein said engagement element may be elastically deflected:
• (i) in a relaxing direction toward an engaged orientation that is functional to provide restraint of said axial displacement of said second seatpost portion relative to said first seatpost portion at a restraining interface with a restraining surface of one of said first seatpost portion or said second seatpost portion;
• and (ii) in a deflecting direction toward a released orientation that is functional to reduce said restraint relative to said engaged orientation;
• wherein said engagement element has an axially maintained engagement with the other one of said first seatpost portion or said second seatpost portion, wherein said maintained engagement is maintained throughout normal operation of said seatpost assembly;
• and
• wherein one of:
• (i) said released orientation corresponds to a radially outwardly expanded orientation of said engagement element relative to said deflected position;
• and (ii) said released orientation corresponds to a radially inwardly contracted orientation of said engagement element relative to said deflected position.