Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Ossa was a motorcycle manufacturer based in Catalonia, Spain which was active from 1924 to 1982. Founded by Manuel Giró, an industrialist from Barcelona, Ossa was best known for lightweight two-stroke-engined bikes used in Observed Trials and Motocross. The company was known originally as Orpheo Sincronic Sociedad Anónima (O.S.S.A.) and was later renamed Maquinaria Cinematográfica, S.A.. The brand still remains popular around the world, and particularly in the United States, among enthusiasts from amateurs in historic motorcycle racing to hobbyists and collectors.