What is a bicycle seatpost

Bicycle seat tube is mainly divided into three kinds: ordinary seat tube, adjustable seat tube, and shock seat tube, the diameter of the seat tube used in different models also varies.

The following is a brief description of the bicycle seat tube. 

Bicycle seat tube diameter is mainly determined by the inner diameter of the bicycle frame riser, the seat tube of different diameters generally need to use the corresponding size of the seat tube clamp, for lower intensity riding environment models will use a relatively small diameter of the seat tube. Common diameter specifications mainly by 27.2mm, 28.6mm, 30.9mm, 31.6mm, and 34.9mm; seat tube length specifications mainly by 300mm, 330mm, 350mm, 580mm, and 600mm, etc.. Ordinary seat tube structure is simple, cost-effective, is the most common seat tube, from the material is divided into steel, aluminum and carbon fiber material. Steel seat tube is generally lower in price, better shock absorption performance, but also heavier. Aluminum seat tube moderate price, slightly lighter weight, but the comfort is not as good as steel seat tube. Carbon fiber seat tube light quality, good comfort, but also higher prices. 

Kunshan Yousen Precision Machinery Co., Ltd. is a domestic private enterprise focusing on the development and production of bicycle parts, specializing in the production of bicycle handlebars, risers, saddle bars, quick release and other parts.