This derailleur was amazingly innovative. It is a proper parallelogram design, mounting on the drop out, with a low gear stop screw and extensive use of aluminium. With all this technology it came on to the market 5 years before Campagnolo’s Gran Sport.

Why is it a forgotten irrelevance? Probably because it was a single pulley design - and so doomed to uselessness.

The Super-Inax Sport is exceedingly similar to the Super JIC Course in this collection, with the crucial difference that the Super-Inax Sport is aluminium and the Super JIC Course is bronze. They are so similar that I have assumed that they came from the same manufacturer.

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• Derailleur brands: Super-Inax, manufactured by JIC?
• Country: France
• Date of introduction: 1946
• Date of this example: unknown
• Model no.: unknown
• Weight: 241g including hanger plate
• Maximum cog: 22 teeth?
• Total capacity: 8 teeth
• Pulley centre to centre: not applicable
• Index compatibility: friction
• Chain width: 3/32” and 1/8”?
• Logic: low normal
• B pivot: sprung
• P pivot: none
• Materials: aluminium rear knuckle and parallelogram arms, steel front knuckle, pulley cage plate and hanger plate.