Zenith Motorcycles was a British motorcycle and automobile manufacturer established in Finsbury Park, London in 1903, by W. G. Bowers. Automobile manufacture only lasted from 1905 to 1906. The first Zenith motorcycle was the 'BiCar' of 1903, based on Tooley's Bi-Car design, which was purchased by Zenith for its own production. The BiCar was a unique design with hub-center steering and a low-slung chassis with the engine centrally fixed.

F. E. Baker Ltd was a British motorcycle engine and cyclecar engine manufacturer based in the Precision Works, Moorsom Street, Birmingham, England. Founded in 1906 by Frank Edward Baker, the company produced motorcycle engines under the Precision trademark until 1919. Precision engines were used by a wide range of motorcycle manufacturers in the United Kingdom and in other parts of the Commonwealth and were also used in cyclecars. Many manufacturers used the 'Precision' trademark as part of their model names, and in 1912 there was a 'Precision' motorcycle sold in Australia, but it is unclear if this was manufactured by F. E. Baker or just permitted use of the trademark by a motorcycle manufacturer.