Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 138,146 pages of information and 223,038 images on early companies, their products and the people who designed and built them.
Downer-Groves were motorcycles produced from 1920 to 1922.
They were designed and constructed by a compulsive inventor named Cecil Downer-Groves at his home/workshop in Croydon, Surrey. Intended for use by himself and his family, the first of his two machines was a motorised cycle fitted with a 1.75hp two-stroke engine that was mounted inside the frame diamond of a gents' safety-cycle. The second machine was a motorised tandem. This was similar to the later autocycle, but more substantial and elongated to provide seating for two. Both machines survived for many years.
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