This is a very beautiful derailleur from Japan’s leading brand of the time. Its geometry is that of the Campagnolo Gran Sport (with the pulley cage pivot exactly between the two pulleys) rather than the geometry of the 1963 Campagnolo Record. It is made in pressed steel, but the pressings and the chrome have a distinct air of accuracy and quality. In terms of build quality, it is easily the equal of its European competitors.

The Sanko PA was used by the Japanese team at the Tokyo Olympics in 1964, an event of great significance for Japanese cycling.

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1. •Brand: Sanko
   

2. •Country: Japan
   

3. •Date of introduction: 1963
   

4. •Date of this example: unknown
   

5. •Model no: unknown
   

6. •Weight: 320g
   

7. •Maximum cog: 28 teeth?
   

8. •Total capacity: 26 teeth?
   

9. •Pulley centre to centre: 45mm
   

10. •Index compatibility: friction
    

11. •Chain width: 3/32”
    

12. •Logic: top normal
    

13. •Pivots: two pivots, front sprung and rear unsprung
    

14. •Material: steel
    

0255/I