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.

---

• Derailleur brands: Peugeot, manufactured by Simplex
• Country: France
• Date of introduction: 1975?
• Date of this example: unknown
• Model no.: SX410
• Weight: 272g
• Maximum cog: 30 teeth (Sutherland’s 4th edition)
• Total capacity: 26 teeth (Sutherland’s 4th edition)
• Pulley centre to centre: 46mm
• Index compatibility: friction
• Chain width: 3/32”
• Logic: top normal
• B pivot: sprung
• P pivot: sprung
• Materials: aluminium knuckles, plastic and steel parallelogram plates and steel pulley cage plates