With a clever cable route, a relatively low price, exceedingly light weight and with a great shift, the SunTour Cyclone was a miracle. To this day the Shimano Dura-Ace is heavier than this Cyclone - proof of the simple purity of the single-sprung pivot slant parallelogram design.

The second style of SunTour Cyclone had a slightly redesigned rear knuckle and a captive short hanger bolt (with a distinctive serrated edge). It gained 4g in weight from these changes.

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1. •Brand: SunTour
   

2. •My category: SunTour - the Cyclone story
   

3. •Country: Japan
   

4. •Date of introduction: 1976?
   

5. •Date of this example: 1977 (two letter date code is TG)
   

6. •Model no: 5902
   

7. •Weight: 179g
   

8. •Maximum cog: 24 teeth (hanger 29mm or less) or 28 teeth (hanger 32mm or more) (Source: SunTour)
   

9. •Total capacity: 24 teeth (hanger 29mm or less) or 26 teeth (hanger 32mm or more) (Source: SunTour)
   

10. •Pulley centre to centre: 46mm
    

11. •Index compatibility: friction
    

12. •Chain width: 3/32”
    

13. •Logic: top normal
    

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

15. •Material: aluminium
    

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