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.

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1. •Brand: Shimano
   

2. •My category: Shimano - from Skylark to world domination
   

3. •Country: Japan
   

4. •Date of introduction: 1977?
   

5. •Date of this example: 1980 (two letter code EG)
   

6. •Model no: SL10
   

7. •Weight: 289g including hanger plate
   

8. •Maximum cog: 28 teeth
   

9. •Total capacity: 28 teeth
   

10. •Pulley centre to centre: 54mm
    

11. •Index compatibility: friction
    

12. •Chain width: 3/32”
    

13. •Logic: top normal
    

14. •Pivots: two sprung pivots
    

15. •Material: steel
    

0154/E