The saddle is too far back to have any aero properties because the air has already become turbulent and the saddle has very little exposed frontal area. If the air flow was still laminar, then the rough underside of the saddle might cause drag.
@Emyr started
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The saddle is too far back to have any aero properties because the air has already become turbulent and the saddle has very little exposed frontal area. If the air flow was still laminar, then the rough underside of the saddle might cause drag.