The Spirax derailleur is just the dab for cycling over the mountainous terrain covered by Michelin map no 77 (Valence & Grenoble). Its spiral spring gives gear changes that are just so smooth - but not as smooooooth as your neatly parted, Brylcreemed hair, classy shades and trim white socks.

• Publisher: Le Cycliste
• Country: France
• Date: 1952
• Derailleur brands: Spirax
• Derailleurs: Le Spirax