In 1896 William Riley Junior formed the Riley Cycle Co. Ltd. Their first offerings were Quadricycle and Tricycle vehicles called the 'Royal Rileys.' By 1898 Percy Riley, a son of William, had created an automobile though it would not enter into production. The car was used a prototype that was used by his family for several years.
During the early 1900s the Riley vehicles continued to evolve. Various body style designs and engines were used but production remained low in the Pre-WWI era. After the war the Riley Companies were restructured. During the 1920's and 1930's the popularity of the Riley automobiles grew rapidly. They offered a variety of vehicles including a Limousine, Sports, Touring, Coupe, and Saloon configuration. Engines sizes were available in four, six, and eight cylinders.
Most recognizable for their racing accomplishments during the 1920's were the Riley Brooklands. These vehicles were renowned for their success in hill climbs and at Le Mans.
The Riley Company produced the 14/6 from 1929 through 1934. It was replaced by the 12/6 which remained in production until 1935 when the company introduced the 15/6. The 15/6 featured a new engine but still retained all of the body-styles of the 14/6 and the Stelvio. The 14/6 had a six-cylinder OHV engine that produced 50 horsepower. It was matted to a four-speed manual gearbox and the body was suspended in place by a semi-elliptic suspension. Top speed was in the neighborhood of 70 mph. The 15/6 was powered by a 1726 cc six-cylinder engine that produced 51 horsepower. By Daniel Vaughan | Sep 2007