Seat post assembly with an adjustable stroke

A seat post assembly for a bicycle, the seat post assembly comprising:

• a first tube having a first distal end;
• a second tube having a second distal end, the first tube being movable relative to the second tube to establish a distance between the first distal end of the first tube and the second distal end of the second tube along a tube axis, the distance between the first distal end of the first tube and the second distal end of the second tube being at a maximum distance when the first tube is in a first position relative to the second tube, and the distance between the first distal end of the first tube and the second distal end of the second tube being at a minimum when the first tube is in a second position relative to the second tube;
• a seal disposed within the second tube, the seal being connected to the first tube or the second tube;
• a piston that is coupled to the seal when the first tube is in the first position relative to the second tube;
• and
• an actuator supported by and rotatable relative to the second tube, the actuator being configured to adjust a position of the seal relative to the second distal end of the second tube, such that the first position of the first tube relative to the second tube is adjustable via the coupling between the piston and the seal.

A seat post assembly for a bicycle, the seat post assembly comprising:

• a first tube having a first distal end;
• a second tube having a second distal end, the first tube being movable relative to the second tube to establish a distance between the first distal end of the first tube and the second distal end of the second tube along a tube axis, the distance between the first distal end of the first tube and the second distal end of the second tube being at a maximum distance when the first tube is in a first position relative to the second tube, and the distance between the first distal end of the first tube and the second distal end of the second tube being at a minimum when the first tube is in a second position relative to the second tube;
• a seal disposed within the second tube, the seal being connected to the first tube;
• a piston that is coupled to the seal when the first tube is in the first position relative to the second tube, wherein the piston includes a piston head and a piston shaft;
• and
• an actuator including an endcap configured to at least partially seal the second distal end of the second tube, the endcap being rotatable and translatable relative to the second tube via a threaded connection of the endcap to the second tube,
• wherein the piston shaft extends through the seal and connects the piston head to the endcap, such that the endcap and the piston head are on opposite sides of the seal, and the endcap and the piston head rotate and translate together,
• wherein when the first tube is in the first position relative to the second tube, the endcap and the piston are rotatable relative to the second tube via the threaded connection in a first rotational direction, such that the endcap and the piston translate in a first translational direction and, via the coupling of the piston to the seal, the first distal end of the first tube translates towards the second distal end of the second tube, and
• wherein the translation of the first distal end of the first tube towards the second distal end of the second tube adjusts the first position of the first tube relative to the second tube, such that the maximum distance between the first distal end of the first tube and the second distal end of the second tube decreases.