This Peugeot derailleur is a Simplex Prestige travelling under an alias. It looks thoroughly metal, with its cast aluminium knuckles and all - but in fact the main structural elements of the parallelogram arms are plastic - the metal is somewhat optimistically referred to as ‘stiffening’.

This derailleur illustrates one of the defining oddities of the Simplex Prestige - the more exotic (and expensive) the model - the greater the weight.

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1. •Brand: Peugeot, manufactured by Simplex
   

2. •My category: Simplex - the Prestige story
   

3. •Country: France
   

4. •Date of introduction: 1975?
   

5. •Date of this example: unknown
   

6. •Model no: SX410
   

7. •Weight: 272g
   

8. •Maximum cog: 30 teeth (Sutherland’s 4th edition)
   

9. •Total capacity: 26 teeth (Sutherland’s 4th edition)
   

10. •Pulley centre to centre: 46mm
    

11. •Index compatibility: friction
    

12. •Chain width: 3/32”
    

13. •Logic: top normal
    

14. •Pivots: two sprung pivots
    

15. •Material: aluminium knuckles, plastic and steel parallelogram plates and steel pulley cage plates
    

0080/C