Abstract: A bicycle seat assembly can include a mounting portion, a seat portion, a locking portion, and an actuator portion. The mounting portion can be configured to engage a frame of a bicycle. The seat portion can be pivotally mounted to the mounting portion. The locking portion can be disposed to selectively lock the mounting portion and the seat portion with respect to one another in a plurality of different seat positions. The seat portion can be moveable among the plurality of different seat positions when the locking portion is in an unlocked configuration and can be fixed in one of the plurality of different seat positions when the locking portion is in a locked configuration. The actuator portion can be engaged with the locking portion and operable to shift the locking portion from the locked configuration to the unlocked configuration. The actuator portion can be hand-operated. Another bicycle seat assembly can include a mounting portion and a seat portion.