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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• 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