Pneumatic height only adjustable seatpost assembly

The invention relates to a pneumatic height only adjustable seatpost assembly. A seatpost assembly for a bicycle includes a first tube having a first distal end and a second tube having a second distal end. The distance between the first distal end of the first tube and the second distal end of the second tube is maximum when the first tube is in the first position relative to the second tube. The seatpost assembly also includes a first chamber and a second chamber fluidly coupleable. The first chamber is a positive fluid chamber and the second chamber is a negative fluid chamber. The seatpost assembly includes a fluid volume disposed in the first chamber and the second chamber. The fluid volume includes a compressible fluid. The first chamber is configured to act as a spring configured to bias the first tube relative to the second tube toward the first position. 本发明涉及气动仅高度调节的座杆组件。用于自行车的座杆组件包括具有第一远端的第一管和具有第二远端的第二管。当第一管相对于第二管处于第一位置时，第一管的第一远端和第二管的第二远端之间的距离最大。所述座杆组件还包括可流体联接的第一腔室和第二腔室。第一腔室是正流体腔室，第二腔室是负流体腔室。座杆组件包括