Seatpost
From Wikipedia, the free encyclopedia
A bicycle seatpost,[1] seatpin,[2] saddlepole,[3] saddle pillar,[4] or saddle pin[5] 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, carbon fiber, or aluminum wrapped in carbon fiber.[6]