Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A bicycle including a forward frame triangle. The forward frame triangle can a top tube, a down tube, a bottom bracket, a lower seat mast, and an upper seat mast. The top tube can have a first end connected to a head tube and a second end. The down tube can have a first end connected to the head tube and a second end. The bottom bracket can be connected to the second end of the down tube. The lower seat mast can extend in an upward direction from the bottom bracket to the top tube. The upper seat mast can at least partially overlap the lower seat mast. The upper seat mast can be adjustably and fixedly coupled to the lower seat mast. The upper seat mast can be rotably coupled to the forward frame triangle proximate the second end of the top tube.

Abstract: A bicycle including a forward frame triangle. The forward frame triangle can a top tube, a down tube, a bottom bracket, a lower seat mast, and an upper seat mast. The top tube can have a first end connected to a head tube and a second end. The down tube can have a first end connected to the head tube and a second end. The bottom bracket can be connected to the second end of the down tube. The lower seat mast can extend in an upward direction from the bottom bracket to the top tube. The upper seat mast can at least partially overlap the lower seat mast. The upper seat mast can be adjustably and fixedly coupled to the lower seat mast. The upper seat mast can be rotably coupled to the forward frame triangle proximate the second end of the top tube.

Abstract: A bicycle including a forward frame triangle. The forward frame triangle can a top tube, a down tube, a bottom bracket, a lower seat mast, and an upper seat mast. The top tube can have a first end connected to a head tube and a second end. The down tube can have a first end connected to the head tube and a second end. The bottom bracket can be connected to the second end of the down tube. The lower seat mast can extend in an upward direction from the bottom bracket to the top tube. The upper seat mast can at least partially overlap the lower seat mast. The upper seat mast can be adjustably and fixedly coupled to the lower seat mast. The upper seat mast can be rotably coupled to the forward frame triangle proximate the second end of the top tube.

Abstract: A bicycle including a forward frame triangle. The forward frame triangle can a top tube, a down tube, a bottom bracket, a lower seat mast, and an upper seat mast. The top tube can have a first end connected to a head tube and a second end. The down tube can have a first end connected to the head tube and a second end. The bottom bracket can be connected to the second end of the down tube. The lower seat mast can extend in an upward direction from the bottom bracket to the top tube. The upper seat mast can at least partially overlap the lower seat mast. The upper seat mast can be adjustably and fixedly coupled to the lower seat mast. The upper seat mast can be rotably coupled to the forward frame triangle proximate the second end of the top tube.