A control device for controlling a bicycle component in accordance with a seat position of a bicycle seat is provided. The control device may comprise a transmitter configured to transmit a signal relating to the seat position of the bicycle seat, and a mounting structure configured to detachably mount the transmitter to at least one of a bicycle seat post, a bicycle frame, and the bicycle seat.

A seat assembly for adjustably connecting a seat to a seat post is provided. The seat assembly may include a slider configured to slide along the seat post, a cam coupled to the slider and movable between a first position and a second position, and a cam washer positioned between the cam and the slider. The cam washer may include a base seated within a cutout disposed in the slider, the base having a non-circular shape for engagement with a complementary shape of the cutout. The cam washer may include a tab extending from the base, the tab seated within the cam. Associated systems and methods are also provided.

A bicycle seatpost assembly comprises a first tube, a second tube, and a positioning structure. The second tube has a distal end to be attached to a bicycle seat and a proximal end opposite to the distal end. The second tube is configured to be telescopically received in the first tube. The positioning structure is configured to position the first tube and the second tube relative to each other. The positioning structure comprises a fluid chamber. The fluid chamber comprises a first chamber, a second chamber, and a movable piston. The first chamber is filled with a first liquid. The second chamber includes a second liquid and gas. The second chamber is disposed closer to the distal end of the second tube than the first chamber. The movable piston divides the fluid chamber into the first chamber and the second chamber. The movable piston is movable within the fluid chamber.

A bicycle seatpost assembly comprises a first tube, a second tube, and a positioning structure. The second tube has a distal end to be attached to a bicycle seat and a proximal end opposite to the distal end. The second tube is configured to be telescopically received in the first tube. The positioning structure is configured to position the first tube and the second tube relative to each other. The positioning structure comprises a fluid chamber. The fluid chamber comprises a first chamber, a second chamber, and a movable piston. The first chamber is filled with a first liquid. The second chamber includes a second liquid and gas. The second chamber is disposed closer to the distal end of the second tube than the first chamber. The movable piston divides the fluid chamber into the first chamber and the second chamber. The movable piston is movable within the fluid chamber.

A bicycle includes front and rear wheels, a frame supported on the front and rear wheels, and a seat post. The frame includes a seat tube having an upper end with a rear wall and a side wall, and the seat post is positioned at least partially inside the seat tube and is secured to the seat tube at a securing location spaced from the upper end. The rear wall of the upper end of the seat tube is spaced from the seat post by a first gap, and the side wall of the upper end of the seat tube is spaced from the seat post by a second gap that is smaller than the first gap. The seat tube has an effective length from a crank axis to the upper end, and the securing location is preferably spaced from the upper end by a distance that is at least 5% of the effective length.

A bicycle frame assembly that includes an upper frame member and a lower frame member that each extend between a head tube and a dropout. A seat tube extends between the upper frame member and the lower frame member. The seat tube is preferably connected to a bottom bracket of the lower frame member and is connected by a pivot to the upper frame member so that the seat tube can deflect from a rest position without altering an orientation of a top tube to a bottom tube of the upper and lower frame members, respectively.

A bicycle frame assembly that includes an upper frame member and a lower frame member that each extend between a head tube and a dropout. A seat tube extends between the upper frame member and the lower frame member. The seat tube is preferably connected to a bottom bracket of the lower frame member and is connected by a pivot to the upper frame member so that the seat tube can deflect from a rest position without altering an orientation of a top tube to a bottom tube of the upper and lower frame members, respectively.

An inner tube moves axially between an outer tube and a support, all of which are concentrically arranged, to a desired telescopic position, relative to the outer tube and the support, and can be locked in the desired telescopic position by applying radial force between the support and the inner surface of the inner tube. The radial force generates a frictional force acting on the inner surface of the inner tube, which resists longitudinal movement of the inner tube. A bicycle actuator cable is coupled to an actuator connector for a tension-controlled actuator by a bicycle cable connector which has a fixed longitudinal position on the bicycle actuator cable. The bicycle cable connector is longitudinally consistently removably repeatably interengageable with the actuator connector to maintain longitudinal alignment of the bicycle actuator cable with the actuator through repeated engagement and disengagement of the bicycle cable connector and the actuation connector.

An inner tube moves axially between an outer tube and a support, all of which are concentrically arranged, to a desired telescopic position, relative to the outer tube and the support, and can be locked in the desired telescopic position by applying radial force between the support and the inner surface of the inner tube. The radial force generates a frictional force acting on the inner surface of the inner tube, which resists longitudinal movement of the inner tube. A bicycle actuator cable is coupled to an actuator connector for a tension-controlled actuator by a bicycle cable connector which has a fixed longitudinal position on the bicycle actuator cable. The bicycle cable connector is longitudinally consistently removably repeatably interengageable with the actuator connector to maintain longitudinal alignment of the bicycle actuator cable with the actuator through repeated engagement and disengagement of the bicycle cable connector and the actuation connector.

A bicycle includes a lower frame member and an upper frame member connected to a head tube. The lower frame member includes a down tube, a bottom bracket, and chain stays. The upper frame member includes a top tube, seat stays, and a passage formed in part by a first side wall and a second side wall. The first and second side walls include a first and second openings, respectively. A seat tube extends in an upward direction from the bottom bracket and through the passage. The seat tube includes an opening that extends laterally therethrough. A passive pivot assembly secures the seat tube within the passage, and includes a guide sleeve that extends through the first opening, through the opening in the seat tube, and through the second opening. One or more fasteners secure the guide sleeve to the upper frame member.