Seatpost

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The seatpost (silver) connects the saddle to the frame (red)

A bicycle seatpost or seatpin is an adjustable tube that extends upwards from the bicycle frame to the saddle. It is made of steel, aluminum, titanium, or carbon fiber. The size of the seatpost is dependent upon the internal dimensions of the seat tube of the bicycle frame. They come in various diameters, lengths and offsets. Offset is the distance between the centerline of the seatpost tube, and the centerline of the clamp area.

Seatpost generally clamp onto saddle rails.

1 Types
- 1.1 Time trial
- 1.2 Suspension
2 External links

[edit] Types

[edit] Time trial

Some modern time trial bicycles are made from one piece of molded carbon fiber with an integrated seatpost that is cut to length depending upon the rider. The advantage is that it is lighter, can be molded into an aerodynamic shape, and removes the need to clamp an irregular tube shape. The disadvantage of this setup is that the seatpost height is not as adjustable. There is usually 2-3 centimeters of adjustment with the clamping device.

[edit] Suspension

Suspension seatposts incorporate a spring or elastomer and possibly a damping mechanism to insulate against bumps. These seatposts are most common on hybrid and mountain bikes.