The Enfield Cycle Company was based in Redditch, near Birmingham, England. Its main products were bicycles and motor cycles manufactured under the Royal Enfield brand.

Possibly in 1935 Enfield introduced a 3-speed derailleur system called the Enfield Easychange. This was fitted to Royal Enfield solo and tandem bicycles in the years up to 1939 and the start of the Second World War. I am not sure whether it was produced after the war - I suspect not. It was only available fitted to a complete bicycle, and used a proprietary braze-on.