Early versions of the B33 had a rigid frame.

1949 BSA B33 Pictures

The 1949 BSA B33 motorcycle was simple and stout -- a design that would carry on through BSA bikes the 1950s.

A "chimney" on the engine enclosed pushrods.

A notch in the fuel tank accommodates the seat.

With just a speedometer, shifting was best done by ear.

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