The Osgear Grand Sport is a child of many parents. Osgear is the brand of the London-based Constrictor Tyre Company and is engraved on the mounting plate, Super Champion is the brand of Paris-based Oscar Egg and is stamped on the main arm, and finally, in small print on the back of the mounting plate, it is revealed that the design is licensed from the French Cyclo company.

The derailleur itself is a classic, chainstay mounting, pull-chain, touring design. It was first released as a Super Champion Grand Sport in 1938, and continued in production in various guises until at least the mid-1950’s.

Chain tension was provided by a spring attached at one end to a clip on the chainstay behind the bottom bracket, and at the other end to the bolt close to the guide pulley.

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1. •Brand: Osgear, manufactured by Super Champion
   

2. •Country: UK, manufactured in France
   

3. •Date of introduction: 1938
   

4. •Date of this example: unknown
   

5. •Model no: unknown (the bracket is stamped 89 or 68)
   

6. •Weight: 245g including mounting bracket, spring and chainstay clip
   

7. •Maximum cog: 28 teeth?
   

8. •Total capacity: 30 teeth
   

9. •Pulley centre to centre: 67mm
   

10. •Index compatibility: friction
    

11. •Chain width: 1/8”
    

12. •Logic: low normal
    

13. •Pivots: one sprung pivot
    

14. •Material: steel
    

0214/G