Another fine Simplex design for a plastic pulley cage, with a modernist look. It was a rigorous, low-cost, design including only 4 pieces, all plastic, in the entire cage and pulley mechanism.

• Publisher: L’Institut national de la propriété industrielle
• Inventor: Henry Juy for Etablissement Le Simplex SARL
• Country: France
• Date: Priority date March 1984
• Derailleur brands: Simplex
• Derailleurs: none