SunTour Cyclone (5902 2nd style)

SunTour Cyclone derailleur (5902 2nd style) main image

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.

  • Derailleur brands: SunTour
  • Categories: SunTour - the Cyclone story
  • Country: Japan
  • Date of introduction: 1976?
  • Date of this example: 1977 (two letter date code is TG)
  • Model no.: 5902
  • Weight: 179g
  • Maximum cog: 24 teeth (hanger 29mm or less) or 28 teeth (hanger 32mm or more) (Source: SunTour)
  • Total capacity: 24 teeth (hanger 29mm or less) or 26 teeth (hanger 32mm or more) (Source: SunTour)
  • Pulley centre to centre: 46mm
  • Index compatibility: friction
  • Chain width: 3/32”
  • Logic: top normal
  • B pivot: unsprung
  • P pivot: sprung
  • Materials: aluminium