Zenith motorcycles were produced in 1904 to 1950 in London factories and the surrounding area of the British capital. With the same years of production motorcycles equipped with engine Zenith Fafnir, Green-Precision, JAP, Bradshaw and Villiers. Since the 30’s almost all models were equipped with motors Villiers.
Before the First World War, Zenith motorcycles were quite popular due to advance engineer Freddie Barnes who developed a lot of interesting mechanisms. For example, the transfer of “Gradua”. His point was that the motorcycle driver could change the ratio V-belt drive, while the belt tension adjusted by mixing the rear wheel forward / backward.
The picture shows a vintage motorcycle Zenith Gradua 1912, equipped with 770 -cc (76×85 mm) JAP engine rated at 6 hp, speedometer Stewart, acetylene light engineering and sidecar.