The success story of BMW motorcycles started at the Berlin Motor Show in 1923. The aero-engine manufacturer presented its first motorcycle with the BMW R 32. The quality of the machine was a major factor for success. All the parts likely to need repair were encapsulated and the drive shaft was easier to service than standard chains or belts. The Boxer engine with cylinders mounted transverse to the direction of motion remains a characteristic feature of BMW motorcycles to this day, alongside the cardan shaft. The very successful overall design of the R 32 was penned by Max Friz and is regarded as a milestone in motorcycle history.