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Seatpost
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, carbon fiber, or aluminum wrapped in carbon fiber.〔(【引用サイトリンク】 Felt 6061 T6 Carbon Seatpost )〕
Seatposts generally clamp onto saddle rails, while old or inexpensive seatposts slide into a separate clamp that then clamps the saddle rails.〔
==Sizes==
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. Shims are often available to adapt a too-small seatpost to a too-large seat tube.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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