
1) Bicycle part
Found on
https://www.crosswordclues.com/clue/seatpost

a post that the seat is mounted to. It slides into the frame's seat tube and is used to adjust ride height depending how far into the seat tube it is inserted.
Found on
http://en.wikipedia.org/wiki/List_of_bicycle_parts

A bicycle seatpost, seatpin, saddlepole, saddle pillar, or saddle pin is a tube that extends upwards from the bicycle frame to the saddle. The amount that it extends out of the frame can usually be adjusted, and there is usually a mark that indicates the minimum insertion (or maximum extension). Seatposts can be made of steel, aluminum, titanium, ...
Found on
http://en.wikipedia.org/wiki/Seatpost
No exact match found.