Alfa Romeo RM

The Alfa Romeo RM was produced between 1923 and 1925, based on the RL model. It was introduced for the first time at the 1923 Paris Motor Show and total production was around 500 cars. The RM had a 2.0 L straight-4 engine which produced between 40 bhp (30 kW) to 48 bhp (36 kW). As were most of Alfa Romeo's cars, this was also used in motorsport. Three versions were made: Normal, Sport and Unificato. Sport had a raised compression ratio, and Unificato had longer wheelbase and a slightly bigger engine. The RM's top speed was around 56 mph (90 km/h).

Alfa Romeo RM
Alfa Romeo RM Sport Castagna.jpg
Alfa Romeo RM Sport with Castagna body
ManufacturerAlfa Romeo
AssemblyPortello, Milan, Italy
Body and chassis
Body stylelimousine
LayoutFR layout
Engine1.9 L I4
2.0 L I4
Transmission4-speed manual[1]
Wheelbase2,900 mm (114.2 in) (RM Sport)
Length4,250 mm (167.3 in)
Width1,680 mm (66.1 in)
Height1,650 mm (65.0 in)
Curb weight1,450 kg (3,197 lb)
PredecessorAlfa Romeo RL
SuccessorAlfa Romeo 6C
Models [2]
Model Engine displacement Max power Years produced
RM Normal 1944 cc 40 bhp (30 kW; 41 PS) (1923)
RM Sport 1944 cc 44 bhp (33 kW; 45 PS) (1924)
RM Unificato 1996 cc 48 bhp (36 kW; 49 PS) (1925)

Alfa Romeo half-trackEdit

A very rare half-track version based on the RM was built in the 1920s. The half-track used an RM straight-4 engine modified to work with dry sump lubrication. The track used was licensed to Citroën Kegresse, and only one example is known survive.[3][4]


  1. ^ "Technical specifications of 1924 Alfa Romeo RM Sport". Archived from the original on 5 February 2008. Retrieved 2008-01-04.
  2. ^ Borgeson (1990).
  3. ^ "1924 Alfa Romeo RM Four Wheel Drive half-track Torpedo". Archived from the original on 2013-04-10. Retrieved 2011-12-17.
  4. ^ "1924 Alfa Romeo RM Four Wheel Drive Winter Sports half-track". Retrieved 2007-12-22.


Borgeson, Griffith (1990). The Alfa Romeo Tradition. Haynes (Foulis) Publishing Group Ltd. Somerset, UK. ISBN 0-85429-875-4.