With a clever cable route, a relatively low price, exceedingly light weight and with a great shift, the SunTour Cyclone GT was a miracle. To this day the Shimano XTR is heavier than this Cyclone GT - 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).

Typically for touring Cyclones, this example is well used. The SunTour Cyclone GT was not just for decoration or a talking point - it was the gear of choice for many a cycle tourist setting out from Britain to Istanbul or wherever. For the cognoscenti it was what you fitted on your hand-built Mercian or Bob Jackson - only blow-hards opted for Campagnolo. I loved it.


  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 TD)

  6. Model no: 5905

  7. Weight: 190g

  8. Maximum cog: 32 teeth (hanger 29mm or less) or 34 teeth (hanger 32mm or more) (Source: SunTour)

  9. Total capacity: 36 teeth (Source: SunTour)

  10. Pulley centre to centre: 67mm

  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 GT (5905 2nd style)