A bicycle saddle assembly, comprising: a main body including a relatively narrow anterior portion which fits between a bicycle rider's crotch, a relatively wider posterior portion for supporting bicycle rider's buttocks, and a longitudinal axis (X-X') which substantially passes through the relatively narrow anterior portion and the relatively wider posterior portion and divides the relatively wider posterior portion symmetrically into a first region and a second region; a suspension member including a pair of annulus cushion bases, a connecting device connecting the annulus cushion bases, and a hanging device disposed between the connecting device and the underside of the main body in such a way that one of the cushion bases is located under the first region of the relatively wider posterior portion and away from the underside of the relatively wider posterior portion at a first predetermined interval and the other of the annulus cushion bases is located under the second region of the relatively wider posterior portion and away from the underside of the relatively wider posterior portion at a second predetermined interval; and a supporting rail for mounting the main body to a bicycle, the rail comprising a wire device having a first rear end, a second rear end, and a bent front portion, with each of the first and second rear ends being coupled respectively on each of the annulus cushion bases and the bent front portion being coupled under the relatively narrow anterior portion of the main body; characterized in that each of the annulus cushion bases includes an upper wall, a lower wall, an outer wall, an inner wall and a bore defined by the walls; wherein the first rear end of the wire device is fixed to the lower wall of one of the annulus cushion bases and the second rear end of the wire device is fixed to the lower wall of the other of the annulus cushion bases; wherein the lower wall of each annulus cushion bases has a center convex with a hole and each of the first and second rear ends of the wire device is inserted respectively into the hole of the center convex of the lower wall of each of the annulus cushion base; and wherein the connecting device includes a flat plate having a first side connected to the inner wall of one of the annulus cushion bases, and a second side connected to the inner wall of the other of the annulus cushion bases. a main body including a relatively narrow anterior portion which fits between a bicycle rider's crotch, a relatively wider posterior portion for supporting bicycle rider's buttocks, and a longitudinal axis (X-X') which substantially passes through the relatively narrow anterior portion and the relatively wider posterior portion and divides the relatively wider posterior portion symmetrically into a first region and a second region; a suspension member including a pair of annulus cushion bases, a connecting device connecting the annulus cushion bases, and a hanging device disposed between the connecting device and the underside of the main body in such a way that one of the cushion bases is located under the first region of the relatively wider posterior portion and away from the underside of the relatively wider posterior portion at a first predetermined interval and the other of the annulus cushion bases is located under the second region of the relatively wider posterior portion and away from the underside of the relatively wider posterior portion at a second predetermined interval; and a supporting rail for mounting the main body to a bicycle, the rail comprising a wire device having a first rear end, a second rear end, and a bent front portion, with each of the first and second rear ends being coupled respectively on each of the annulus cushion bases and the bent front portion being coupled under the relatively narrow anterior portion of the main body; characterized in that each of the annulus cushion bases includes an upper wall, a lower wall, an outer wall, an inner wall and a bore defined by the walls; wherein the first rear end of the wire device is fixed to the lower wall of one of the annulus cushion bases and the second rear end of the wire device is fixed to the lower wall of the other of the annulus cushion bases; wherein the lower wall of each annulus cushion bases has a center convex with a hole and each of the first and second rear ends of the wire device is inserted respectively into the hole of the center convex of the lower wall of each of the annulus cushion base; and wherein the connecting device includes a flat plate having a first side connected to the inner wall of one of the annulus cushion bases, and a second side connected to the inner wall of the other of the annulus cushion bases.