After cancelling automobile production (1936), Zbrojovka (Brno) was looking for a supplementary civil programme. “Motorwheel”, a small motorcycle following the tradition of bicycle production, was considered. Ing. Josef Ullman was entrusted with the design. He finished the first prototype “Z 2” in 1939. However, it was actually a small motorcycle with a 98 cm3 engine. Further works were interrupted by the occupation; however Ing. Ullman was secretly carrying on with the project.  The production of an enhanced version was ready by 1945. Ten prototypes were created in 1946 that successfully passed tests, and thus the motorcycle was included in the capacity...