"The Rolls-Royce 15 hp was one of four cars to be produced as a result of an agreement of 23 December 1904 between Charles Rolls and Henry Royce. Badged as a Rolls-Royce, the 15hp was produced by Royce's company, Royce Ltd., at its factory in Trafford Park, Manchester. It was sold exclusively by Rolls' motor dealership, C.S.Rolls & Co., at a price of GBP500. The 15hp was exhibited at the Paris Salon in December 1904, along with the 10hp, 20hp and engine for the 30hp models, but as the new three cylinder engine was not ready the chassis was incomplete.The car has a top speed of 39 mph (63 km/h). There is a transmission brake fitted behind the gearbox operated by foot pedal and internal expanding drum brakes on the back axle operated by the handbrake lever. Springing is by semi-elliptic leaf springs on both front and rear axles with an additional cross-ways helper spring on the rear of some of the cars. Artillery type wheels were fitted."Out of the six that were produced, only one car is known to survive.
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