A bicycle seat post and clamp for mounting in the seat tube of a bicycle frame and clamping to the bicycle seat rails. The seat post has a straight section to insert into the seat tube and a preferably toroidal section that is clamped by the clamp. The clamp includes a cradle with hooks at opposing ends that extend around seat rails, and a strap with hooks at opposing ends to extend around the seat rails in the opposing direction. A screw extends between two legs making up the strap for tightening the strap, thereby decreasing the size of the opening formed by the clamp, thus clamping the clamp to the seat post and the seat rails.