The company branched out into car manufacturing in 1903 and motorcycles in 1911. Lea-Francis built cars under licence for the Singer company. In 1919, they started to build their own cars from bought-in components.
From 1922, Lea-Francis formed a business relationship with Vulcan of Southport sharing manufacturing and dealers. Vulcan supplied bodies to Lea-Francis and in return got gearboxes and steering gear. Two six-cylinder Vulcan-designed and manufactured cars were marketed as Lea-Francis 14/40 and 16/60 as well as Vulcans. The association ended in 1928 when Vulcan stopped making cars.
The company was re-formed in 1937 under the chairmanship of George Leek with other ex-Riley Motor men such as R.H. Rose who designed a new engine for Lea-Francis having a similar layout to the Riley 12/4.
Post-war car production commenced in 1946 with updated vehicles based on the pre-war designs. The company had a chequered history with some notable motorcycles and cars but financial difficulties surfaced on a regular basis. The Hillfields site was abandoned in 1937 when it was sold by the receiver and a new company, under a slightly different name, moved to Much Park Street in Coventry. It survived there until 1962 when the company finally closed.
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