This, uncharacteristically stylish, leaflet shows a chainguard that hides a mysterious mechanism. This hidden device enables you to use a derailleur with a coaster brake, as it takes up the slack in the top run of the chain when you back-pedal.

A chain tensioner that does something similar (but without the chainguard) is shown on page 18 of Cyclo's Catalogue 559 from 1955.

The Perry Chain Company, maker of the Perry Coaster Hub, was based in Tyseley, Birmingham, and so was local to the Cyclo Gear Company.

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• Publisher: Cyclo Gear Company
• Country: UK
• Date: 1955?
• Derailleur brands: Cyclo Gear Company
• Derailleurs: Cyclo Benelux