|1949 to 1951|
|Production||1949–51 502 produced|
|Body and chassis|
|Body style||2-door convertible|
|Engine||2.5 L Straight-4|
The RMD was a traditional 2-door drophead coupé, the last convertible to wear the Riley name.
It used the same 2.5 L 100 hp (75 kW) engine as the RMB, on which it was based.
Just over 500 were produced between 1949 and 1951.
Engine and transmission: Four-cylinders, in-line, with two block-mounted camshafts, and pushrod overhead valve cylinder head. Bore, stroke and capacity 80.5 X 120mm., 2443cc. Maximum power 100bhp at 4500rpm.; maximum torque 1321b.ft. at 3000rpm. Four-speed manual gearbox in unit with engine. Spiral bevel final drive at first, hypoid bevel from 1952.
Chassis: Front engine, rear drive. Separate steel chassis frame, with box-section sidemembers, and tubular cross-bracing. Independent front suspension by torsion bars and wishbones. Rack and pinion steering. Suspension of rear live axle by half-elliptic leaf springs, with torque tube location until 1952. Four-wheel drum brakes.
Bodywork: Coachbuilt bodyshell, with wood framing and steel skin panels, or two-door drophead by Nuffield.