A telescopic bicycle seatpost is adjustable to fit on many different bicycle sizes, for riders of different heights and leg length. The telescopic length of the seatpost is able to be adjusted after the seatpost has been installed on the bicycle and without removing the seatpost from the frame, which enables the frame and seatpost combination to be quickly adjusted for different users of the same bicycle, in instances where the bicycle is shared between two or more riders or is used as part of a rental fleet.

A telescopic bicycle seatpost is adjustable to fit on many different bicycle sizes, for riders of different heights and leg length. The telescopic length of the seatpost is able to be adjusted after the seatpost has been installed on the bicycle and without removing the seatpost from the frame, which enables the frame and seatpost combination to be quickly adjusted for different users of the same bicycle, in instances where the bicycle is shared between two or more riders or is used as part of a rental fleet.

A dropper post assembly for supporting a bicycle seat may have an outer tube and an inner tube having a clearance portion and an upper end that includes an inward facing axial stop surface that defines a laterally extending abutment plane. A spring cartridge assembly has a cartridge cross-sectional that is less than 90% of the interior cross-sectional area of the clearance portion. A lower engagement member is disposed toward a lower end of the inner tube and substantially fills a lateral between lower end of the cartridge tube and the inner tube. A post head member has a front fastening aperture, a lowermost part oof which lies in a laterally extending post head plane that is disposed axially inboard from the abutment plane.

A dropper post assembly for supporting a bicycle seat may have an outer tube and an inner tube having a clearance portion and an upper end that includes an inward facing axial stop surface that defines a laterally extending abutment plane. A spring cartridge assembly has a cartridge cross-sectional that is less than 90% of the interior cross-sectional area of the clearance portion. A lower engagement member is disposed toward a lower end of the inner tube and substantially fills a lateral between lower end of the cartridge tube and the inner tube. A post head member has a front fastening aperture, a lowermost part oof which lies in a laterally extending post head plane that is disposed axially inboard from the abutment plane.

A dropper post may include an outer tube and an inner tube slidable relative to the outer tube between an extended position and a retracted position. A spring cartridge may include an axially extending cylinder containing a combination of a liquid and a gas and having a sliding surface and a piston with a sealing portion dividing the cylinder interior to provide a first chamber and a second chamber. Moving the inner tube toward the retracted position expands the first chamber. When inner tube is in the extended position the sealing portion is at least partially submerged in the liquid, the second chamber contains a layer of the gas above a layer of the liquid and the first chamber contains the liquid and when the inner tube is in the retracted position the first chamber contains the liquid and a layer of gas between the liquid and the sealing portion.

A dropper post may include an outer tube and an inner tube slidable relative to the outer tube between an extended position and a retracted position. A spring cartridge may include an axially extending cylinder containing a combination of a liquid and a gas and having a sliding surface and a piston with a sealing portion dividing the cylinder interior to provide a first chamber and a second chamber. Moving the inner tube toward the retracted position expands the first chamber. When inner tube is in the extended position the sealing portion is at least partially submerged in the liquid, the second chamber contains a layer of the gas above a layer of the liquid and the first chamber contains the liquid and when the inner tube is in the retracted position the first chamber contains the liquid and a layer of gas between the liquid and the sealing portion.

A dropper post assembly for supporting a bicycle seat may have an outer tube and an inner tube having a clearance portion and an upper end that includes an inward facing axial stop surface that defines a laterally extending abutment plane. A spring cartridge assembly has a cartridge cross-sectional that is less than 90% of the interior cross-sectional area of the clearance portion. A lower engagement member is disposed toward a lower end of the inner tube and substantially fills a lateral between lower end of the cartridge tube and the inner tube. A post head member has a front fastening aperture, a lowermost part of which lies in a laterally extending post head plane that is disposed axially inboard from the abutment plane.

A dropper post assembly for supporting a bicycle seat may have an outer tube and an inner tube having a clearance portion and an upper end that includes an inward facing axial stop surface that defines a laterally extending abutment plane. A spring cartridge assembly has a cartridge cross-sectional that is less than 90% of the interior cross-sectional area of the clearance portion. A lower engagement member is disposed toward a lower end of the inner tube and substantially fills a lateral between lower end of the cartridge tube and the inner tube. A post head member has a front fastening aperture, a lowermost part of which lies in a laterally extending post head plane that is disposed axially inboard from the abutment plane.

A seat post assembly includes a seat post that is electrically adjustable in height. The adjustability may be based on one or more pressures sensed by one or more sensors within the seat post assembly, respectively. The disclosed seat post assembly includes an electronics module. The electronics module may be carried under the seat or saddle and may include a pressure sensor or pressure sensor circuitry.

A seat post assembly includes a seat post that is electrically adjustable in height. The adjustability may be based on one or more pressures sensed by one or more sensors within the seat post assembly, respectively. The disclosed seat post assembly includes an electronics module. The electronics module may be carried under the seat or saddle and may include a pressure sensor or pressure sensor circuitry.