GRI were motorcycles produced from 1920 to 1922. Distributed by Macrae and Dick of Inverness, the engine was designed by G. R. Inshaw.
The machine was first promoted in 1920 and was produced in 348cc and 496cc sizes with one overhead valve opened by a chain-driven ohc and rocker, and a rotary valve.
The engine was fitted into a conventional frame with Brampton forks. It had a two-speed Sturmey-Archer gearbox with belt final-drive.
As rotary valves were noted for being unreliable, the public did not take to the machine and it soon slipped from sight.
See Also
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Sources of Information
- 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
- The Encyclopedia of the Motorcycle by Peter Henshaw. Published 2007. ISBN 978 1 8401 3967 9