Abstract: A support structure having a seat surface (2), particularly for bicycles and other pedal operated machines, comprises a substantially rigid or semirigid frame (3), means for connecting the frame (3) to the bicycle or a pedal operated machine, a yieldable padding (7) secured to the top face of the frame (3), a covering layer (8) superimposed to the yieldable pad (7), characterized in that the frame (3) has one or more differential rigidity portions (11, 11?) adapted to facilitate the pedaling motion. The differential rigidity portions (11, 11?) are situated at an outer peripheral edge (13) of the frame (3), along which at least one recess (12) is provided. Each differential rigidity portion (11, 11?) comprises a plurality of projections (14) extending outwardly of recesses (12) formed in the frame (3).

Abstract: A support structure having a seat surface, particularly for pedal operated machines, such as bicycles, comprises a substantially rigid or semi-rigid frame, means for connecting the frame to the pedal operated machine, a yieldable padding secured to the top face of the frame, a covering layer superimposed to the yieldable pad, wherein the frame has one or more differential rigidity portions, preferably adapted to facilitate the pedaling motion. The differential rigidity portions are preferably situated at an outer peripheral edge of the frame, along which at least one recess is provided. Each differential rigidity portion comprises a plurality of outwardly extending projections.

Abstract: A support structure having a seat surface (2), particularly for bicycles and other pedal operated machines, comprises a substantially rigid or semirigid frame (3), means for connecting the frame (3) to the bicycle or a pedal operated machine, a yieldable padding (7) secured to the top face of the frame (3), a covering layer (8) superimposed to the yieldable pad (7), characterized in that the frame (3) has one or more differential rigidity portions (11, 11?) adapted to facilitate the pedaling motion. The differential rigidity portions (11, 11?) are situated at an outer peripheral edge (13) of the frame (3), along which at least one recess (12) is provided. Each differential rigidity portion (11, 11?) comprises a plurality of projections (14) extending outwardly of recesses (12) formed in the frame (3).