Manufactured: 1951-1958 1
Founded in 1955 in Reggio Emilia near Milan by a group of technicians previously of Motom, the Società Italiana Motori built 3-speed 48cc four-stroke Pegaso mopeds with pressed metal frames.
Also in 1953, SIM lists a SIM-Moretti 125cc twin. In 1953 or 1954, an Ariete unfaired scooter was offered. In 1958 new model mopeds were introduced, the T, the GT, the TV and the most powerful, an S model of 3hp.
SIM Moretti 125 1950-1952
Sim Ariete 150cc Scooter 1952-1954
SIM-CAR 150cc commercial three-wheeler, based on the scooter c1952-1954
SIM Gran-Turismo with Week End sidecar c1952-1954
SIM Gran Lusso conventional scooter with dual saddles c1952-1954
1) There appears to be some confusion about dates. One source says founded 1951, another 1956. It is entirely possible that there are two different marques, but sales literature shows, so far, only the one. The literature names them as both Società Italiana Moto Scooters and Società Italiana Motoscooter. One source says they closed in 1955.
2) It is believed that Rene Guiller marketed SIM scooters under licence in France in 1955 and possibly later.
Sources: MC Storico Conti, Henshaw, et al.