SunTour made a real effort with their 1987 range. To support index shifting the Cyclone 7000 got two sprung pivots. The quality of finish was improved from the 6000 series, in particular the coloured finish on the outer parallelogram plate cage was tougher and the writing lasted more than 5 seconds. The overall effect was more composed and integrated.

None of this made much difference. In 1987 the new game in town was indexing. Accurate indexing requires an optimised system involving all the transmission components, and SunTour had not managed to optimise the chain, freewheels, levers, inner cable or cable outer - and because of this the Cyclone 7000 never indexed reliably.

This is a short pulley cage version - there is also a long cage version (model number CL10-GT).


  1. Brand: SunTour

  2. My category: SunTour - the Cyclone story

  3. Country: Japan

  4. Date of introduction: 1987

  5. Date of this example: 1987 (two letter date code is DE)

  6. Model no: CL10-SS

  7. Weight: 218g

  8. Maximum cog: 26 teeth (hanger 24mm) or 28 teeth (hanger 26mm or more) (Source: Sutherland’s 6th edition)

  9. Total capacity: 28 teeth (Sutherland’s 6th edition)

  10. Pulley centre to centre: 56.5mm

  11. Index compatibility: 6 speed

  12. Chain width: 3/32”

  13. Logic: top normal

  14. Pivots: two sprung pivots

  15. Material: aluminium


SunTour Cyclone 7000 (CL10-SS)