With the closing of the 1970s the already venerable Skylark design took a small, but significant steps forward. The cable clamp was mounted on the outer parallelogram plate - changing the geometry of the gear, as previously the cable clamp was attached to the front knuckle.

This change persists to this day, and somehow, a decade later, enabled what is basically a 1960s design to index accurately and reliably. Spooky.

• Derailleur brands: Shimano
• Categories: Shimano - from Skylark to world domination
• Country: Japan
• Date of introduction: 1977?
• Date of this example: 1980 (two letter code EG)
• Model no.: SL10
• Weight: 289g including hanger plate
• Maximum cog: 28 teeth
• Total capacity: 28 teeth
• Pulley centre to centre: 54mm
• Index compatibility: friction
• Chain width: 3/32”
• Logic: top normal
• B pivot: sprung
• P pivot: sprung
• Materials: steel

Ref. 154