There are many online vendors for classic motorcycles that buy and sell BSA Motorcycles parts. BSA was the number one producer of motorcycles in the world between the second half of the 1930s and the early years of the 1960s. The Birmingham Small Arms Company was started in 1861 as a gun manufacturer that supplied the British government during the Crimean War before producing highly sought after motorcycles
Serious collectors restore vintage motorcycles from BSA's decades of prosperity and the demand for parts is high. The popularity of the bikes when they were released determines the availability of spare parts. In general, small collectors and suppliers only have a limited stock of motorcycle parts from the models that weren't strong sellers. Some engineering companies help to fill the gap by manufacturing new parts for many BSA motorcycles.