Described by The Motor Cycle as "most economical, comfortable and fast, handy in traffic, excellent steering and brakes", the B31 is one of the most popular machines on the road. Many outstanding features combine to make this machine far ahead in performance and value - duplex cradle frame, swinging arm rear suspension, full width aluminium alloy hubs and powerful brakes, quickly detachable rear wheel - are but a few.
The BSA B31 had an OHV 350cc engine and remained in service for many years.
B31 350 1945-59
348cc OHV single, 365lb, 80mpg, 75mph
A robust engine fitted initially in a rigid frame with telescopic forks. In 1949 plunger suspension was fitted and then in 1954 swinging arm rear suspension.
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