BSA's adventure began in 1861, in England, the company being founded by fourteen gunsmiths of the Birmingham Small Arms Trade Association, who had supplied arms to the British government during the Crimean War.
As the gun trade declined, they began to manufacture bicycles in 1880. The first motorcycle was produced in 1903.
During the World War I and II, the company produced a lot of rifles, shells and motorcycles for the troops and post-war, BSA expanded the range of goods it manufactured. From 1937, it supplied 126,000 M20 motorcycles to the armed forces. In 1951, the BSA Group bought Triumph Motorcycles, increasing their fame and production and in 1954 entered a team of riders in the 200 mile Daytona beach race where the bikes took first, second, third, fourth, and fifth places. Ten years later, BSA gained fame in motocross, thanks to Jeff Smith and his B40.