Alfa Romeo RM was produced between 1923–1925, it was based on RL model. Car was introduced first time in 1923 Paris Motor Show and total production was around 500 cars. RM had 2.0 L straight-4 engine, which produced between 40 bhp (30 kW) to 48 bhp (36 kW). As most of Alfa Romeo cars this was also used in racing purpose. Three versions was made: Normal, Sport and Unificato. Sport had raised compression ratio and Unificato had longer wheelbase and slightly bigger engine. RM top speed was around 90 km/h (56 mph).
- RM Normal, 1944 cc 40 bhp (1923)
- RM Sport, 1944 cc 44 bhp (1924)
- RM Unificato, 1996 cc 48 bhp (1925)
Alfa Romeo half track
A very rare half track version based on RM was built in 1920s. The half track used RM straight-4 engine modified to work with dry sump lubrication. The track used was Citroën Kegresse licensed, only one example is known survive.