A bicycle seat assembly includes a seat (10) having two rear connection portions located at the rear end of the underside thereof and an elongate frame (20) is connected to the underside of the seat (10). The frame (20) includes a rear fork portion (30) formed at the rear end thereof and the rear fork portion (30) includes two rear fork rods which are connected to two rear connection portions. A locking unit (50) includes a first locking member and a second locking member, wherein the first locking member extends through the front end of the seat (10) and the second locking member extends through the front end of the frame and is connected to the first locking member so as to connect the frame (20) to the underside of the seat (10). The rear fork rods provide sufficient support at the rear end of the seat (10).
