What key feature defined Joanny Panel's manufacturable 1912 derailleur, 'Le Chemineau'?
Answer
Guide pulley and tension pulley on a sprung arm
Joanny Panel is credited with transforming Velocio's vision into a practical, mass-producible reality with the 'Le Chemineau' in 1912, which marks a true genesis point for modern derailleur design. This mechanism successfully integrated several elements essential for contemporary systems: the chain moved sideways across a cluster of sprockets, and critically, it incorporated both a guide pulley and a tension pulley attached to a sprung arm. Furthermore, Panel introduced operation via a cable pulled by a lever, setting a standard for derailleur design that persisted for many years despite the technology taking time to gain widespread traction.
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