The 500B, presented at the 1948 Geneva Motor Show, represented the development of the pre-war model. Almost unchanged in appearance (the changes mostly concerned the dashboard and the steering wheel), it instead had a new engine, type 500B 569cc, slightly more powerful than that of the 500A. Performance also improved as a result, with a top speed going from 85 to 95 km / h. The 500B remained in production until 1949, when it was replaced by the 500C.