SV.VM (Sironi Vergani Vimercate Milano) was founded in 1971 by Piero Sironi and Fausto Vergani and was based in Milan, Italy. SWM manufactured Observed Trials, Enduro, Motocross and off-road motorcycles in the 1970s and 1980s. They started with small capacity Sachs engined enduro bikes and began making Rotax engined trials bikes in 1977.
The other main manufacturers at this time included Fantic Motor, Bultaco and Montesa. Making the announcement during ECIMA 2014 show in Milan, SWM are back on the market by introducing six street and off-road bikes with engine size between 300 and 650cc.
SWM went in liquidation in 1984 and production ceased. There are still people out there riding SWMs in classic and twinshock trials in the UK. Rotax engines spares are still readily available, with many of the other spares that went out of production, like the Acerbis plastics, are being produced and distributed by specialist companies such as MotoSWM in the UK and MidWest SWM in the U.S..
Engineer Ampelio Macchi, formerly with Cagiva, Aprilia and Husqvarna, is driving the resurgence of the SWM brand with six new models displayed at EICMA 2014. Funding for the company has come from China via the entity Shineray Group. SWM will keep manufacturing in Italy. Apparently, some of its engines will be acquired from the old Husqvarna (engines replaced by KTM units following the acquisition by Peirer).