In 1950, the BMW R 25 replaced the BMW R 24 as a single-cylinder model. The welded, tubular frame once again permitted a sidecar to be mounted and the wide, sweeping front mudguard protected the rider against spray water. The most striking innovation was the plunger rear-wheel suspension, which had previously been reserved for the twin-cylinder models. The BMW R 25 proved to be extremely popular and 23,400 units were manufactured. Although this motorcycle was sold at a relatively high price, the BMW single-cylinder model appealed to the motorcycling public. More than 100,000 units of the R 25 and its successor models R 25/2 and R 25/3 rolled off the assembly line.