Grace's Guide

British Industrial History

Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,416 pages of information and 233,868 images on early companies, their products and the people who designed and built them.

Lucien Juy

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Lucien Charles Hippolyte Juy was a French industrialist who made derailleur gears. He is credited with making the first derailleur with a collapsible parallelogram. A hinged frame swung in and out from the frame and fed the chain to one of a number of sprockets attached to the hub. [1]

Juy's derailleurs, sold as Simplex derailleurs, often on Peugeot models were novel in having a jockey wheel to correct the tension of the chain as it moved across differently sized sprockets. [2].

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