a bicycle seat height adjusting assembly comprises of a seat post that axially slides into an insert tube that fits into a bicycle frame in the place of a conventional seat post . the front of the insert tube has a plurality of evenly spaced locking holes sized to receive a locking pin . the locking pin with supplemental spring is positioned within the lower section of the seat post . a main air spring is positioned within the seat post to keep the main air spring free from dirt interference , allow the post to fully rise and lower , and enable the use of a maximum height pre - adjustment system . a first longitudinal groove positioned along the inner wall of the insert tube contains a spline rod with wedging projections . the spline rod is connected to a cable that extends out to an actuation lever that is positioned on the handlebars . as the actuation lever is pulled , the wedging projections push the locking pin out of the locking holes where the main air spring causes the seat post to rise .