In its 'TT' guise the Sprite winning the Ulster Tourist Trophy in both 1935 and 1936 with the legendary Freddie Dixon at the wheel, while there were numerous privateer successes at Brooklands and elsewhere. Dixon's winning car formed the basis for the production Sprite two-seater introduced at the 1935 Motor Show. Clearly related to that of the existing Imp and MPH sports cars, the Sprite's handsome streamlined bodywork was distinguished by a 'fencer's mask' front grille. The chassis was MPH based and under-slung at the rear, while there was a choice of either manual or Wilson pre-selector transmissions. The Sprite was priced at £425 when launched and continued in production until 1938. 55 Riley Sprite were built.
The body was two-seater roadster. The model had installed the engine of 12/4, namely a four-cylinder overhead valve from 1,496 cc displacement. Compared to the power unit of 12/4, this engine produced more power, 61 hp, 10 more than the original 51 hp, because it had installed two SU carburetors. Compared to 12/4, the Sprite had a weight and smaller dimensions.
The model, sporty and elegant, could reach a top speed of 141 km / h.
This chassis ran the 1937 MCC Trial and the 1949 Lands and Trial.