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.


  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


SunTour Cyclone (5902 2nd style)