The Riley 12 was a midsize car with a V2 engine. The car was introduced by Riley in 1907.
The car had a V2 engine with 2035cm³ displacement, lateral vertical valves and water cooling. The engine produced 12 bhp (8.8 kW).
The chassis was available with in a length of 2286 mm or 2667 mm. The body was between 3,429 mm and 3,810 mm long and 1,676 mm wide. The chassis weighed 682 kg.
Like all Riley vehicles, the 12 had detachable wire wheels.