Sironi Vergani Vimercate Milano was formed in 1971 in Milan, Italy. It used to manufacture off-road and trials bikes in the 1970s and 1980s. 1984 was when production ceased. 2014 saw a revival of the brand, with funding coming from the Shineray Group out of China. SWM now stands for Speedy Working Motors, and there are six models that cover off-road and street usage. Displacement ranges from 300 to 650cc.