BSA B21

During the depression of the 1930s, BSA rationalised its model range. In 1937 BSA B21 introduced a new series of models designed by Val Page. The B21 was the 250 cc overhead valve model in this range, which also included the M23 Empire Star in 500 cc form.^[3]

The B21 used a single-cylinder OHV engine with magneto ignition, an Amal carburettor and a four-speed hand-change gearbox. Front suspension was by spring-loaded girder forks the rear was unsprung, with rider comfort provided by a sprung saddle.^[4]

When the Second World War began, BSA's production switched to military contracts. The BSA M20, a 500 cc side-valve model, was adopted as a military motorcycle, and the B21 was discontinued.^[3]

• List of BSA motorcycles
• Val Page
• BSA M20