OK-Supreme Motors Ltd, of Bromley St, Birmingham, maker of OK-Supreme motorcycles
The OK Supreme Company of Birmingham was a family concern of Ernie Humphries, and involving his son John and daughters Freda and Alice. The Humphries designed an attractive range of sporty machines mostly fitted with JAP engines
1927 Only JAP engines were used. A machine was placed at the TT, to take third in the Lightweight.
1928 A machine fitted with a modified JAP engine, with a new cylinder head, twin exhaust ports and a down-draught inlet, won its Lightweight class at the TT. Ernie Humphries bought the failing HRD Motors for the factory and tools, selling the rest, including the name, to Philip Vincent.
1930 Expansion continued, but it was the older models with JAP engines that were placed in the TT.
1931 A Lighthouse 25cc to 348cc model, so named because of the little inspection window in the cam tower, was launched.
The firm began to give all its models names. The best knowm were the Flying Clouds. All the machines kept pace with changing trends and engines developed, most from JAP.
1939 Matchless engines appeared.
1940 Although production had ceased the previous year, OK-Supreme was still listed until the end of the year. The firm then became involved with vital war work.
- Note: Even though production ceased in 1939, 350cc JAP-engined OK-Supreme grass track racing machines were still available through John Humphries until his death in 1946. (John was the son of founder Ernie Humphries).
National Motorcycle Museum exhibits:-
- 1939 OK Supreme 250cc Overhead Camshaft Racing Machine
Sources of Information
-  Wikipedia
- Miller’s Price Guide to Classic Motorcycles
- The British Motorcycle Directory - Over 1,100 Marques from 1888 - by Roy Bacon and Ken Hallworth. Pub: The Crowood Press 2004 ISBN 1 86126 674 X
-  Ian Chadwick's motorcycle web site
-  Yesterday's Antique Motorcycles web site
-  Cyber Motor Cycles web site