BMW R 4

The single-cylinder BMW R 4 with 400 cc augmented the production range of BMW in 1932. The machine was derived from the successful BMW R 2 and closed the gap which had separated the BMW R 2 and the 750 cc models, R 11 and R 16, since the 500 cc models had been discontinued. Power output of 12 hp and a price of 1,250 reichmarks enabled it to provide serious competition for the side-valve 500 cc motorcycles on the market at the time and it proved to be extremely popular. Government agencies, such as the military and the police, ordered several thousand of the dependable utility motorcycle.