Abstract: A molded, lightweight pneumatic bicycle saddle. The saddle is molded entirely of plastic and includes a relatively rigid lower wall providing structural support and strength to the saddle and a flexible upper wall providing comfort to the rider. The lower wall may also include a plurality of ridges angularly disposed with respect to one another to provide additional strength thereto. A valve is provided for inflation of the saddle. The bicycle of this invention is molded ina low pressure process such as rotocasting or reaction injection molding. In the rotocasting method, the same material is used for both walls but the upper wall is provided with a lesser thickness than the lower wall. In the reaction injection molding technique, the differences in rigidity are provided by forming each wall of a different material having the desired flexibility.