OK-Supreme was a British motorcycle manufacturer from 1899 to 1939 located in Birmingham. Grass-track racing versions of the machines continued to be available until 1946.
History
In 1882 Ernie Humphries and Charles Dawes founded "OK" as bicycle manufacturers. They experimented with powered bicycles in 1899 and 1906, before manufacturing a two-stroke motorcycle using a Precision engine in 1911. Before the First World War they had produced motorcycles with Precision, De Dion, Minerva, and Green engines. Their first entry in the Isle of Man TT, in 1912, led to a ninth place[1] and mainly modest results came during the following years with OK-Supreme machines scoring three podium places and 34 finishes.[2]
After the war OK produced a 292 cc two-stroke motor of its own, but also produced models using Blackburne (250 cc and 350 cc, sv and ohv), Bradshaw (348 cc oil cooled), and