SM is a defunct Polish motorcycle manufacturer founded by Stefan Malcherek. They produced lightweight motorcycles in Poznań, Poland from 1937 to 1939 and also supplied engines to other manufacturers.
|Founded||1937 in Poznań, Poland|
Stefan Malcherek established the SM Workshop in Poznań in 1924, which manufactured a 50 cc auxiliary engine that could be fitted to a bicycle. It was mounted above the front wheel and drove the wheel by means of a roller. At the 1935 Poznań Fair he presented a 2hp two-stroke outboard motor which was well received. He adapted the 98 cc engine for use in a motorcycle and constructed a light motorcycle around the engine. The machine debuted at a competition organised by the Unia motorcycling club in December 1937. Although the competition was won by a German Phanomen machine, the SM was seen to be a good competitor. The machine went into production and was well received for its reliability.
SM supplied the engine to two other Poznań manufacturers: Nowaczyk Brothers' Bicycle Manufacture for use in their WNP 3-wheelers and Automatyk for their Zuch 98cc motorbike. Production ceased following the German invasion of Poland in 1939.
The unit construction 98 cc two-stroke engine was cast from light alloy except the cylinder which was cast iron. It was fitted with a 2 speed gearbox, which was hand operated by a lever attached to the top of the gearbox. The engine produced 3 hp at 3,500 rpm.
- Tarczynski, Jan (2005). Polskie motocykle : 1918-1945 (Wyd. 3 (rozsz.) ed.). Warszawa: Wydawnictwa Komunikacji i Łączności. ISBN 978-8320615791.
- "Malcherek - Simson Suhl". zabytkowemotocykleirowery.pl. Retrieved 29 August 2020.
- Tarczyński, Jan (November 1983). "Motocykle Polskie 1918-1939 SM 98, WNP i ZUCH - Artykuły - IKM". ikm.wz.cz (in Polish). Retrieved 29 August 2020.
- "Malcherek 98". zabytkowemotocykleirowery.pl. Retrieved 29 August 2020.