A bicycle seatpost, seatpin, or saddlepole 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).
Frame component onto which the saddle is attached. The seatpost is inserted into the seat tube.
The removable and adjustable (sometimes chrome) tube that the saddle mounts onto. See photo below.
A vehicle composed of two wheels held in a frame one behind the other, propelled by pedals and steered with handlebars attached to the front wheel
ride a bicycle
a wheeled vehicle that has two wheels and is moved by foot pedals
In graph theory, a pseudoforest is an undirected graphThe kind of undirected graph considered here is often called a multigraph or pseudograph, to distinguish it from a simple graph. in which every connected component has at most one cycle.
seat-post boring bar parts
Starting with 7/8" 4130 bar, 3/8" drill rod, and 3/8 HSS round. (and a bolt) The rod gets brazed into the bored end of the tool (you can see the vent hole for filler).
Gipiemme Crono Sprint 600DD Seat Post
Gipiemme Crono Sprint 600DD Light Alloy Seat Post
I have been after one of these Gipiemme seat posts in 27mm diametre for ages. Finally tracked one down via eBay - France.