SunTour Trimec black (4600)

SunTour Trimec black derailleur (4600) main image

This gear caused me distress and dismay when it appeared. SunTour seemed to have abandoned the best design in the world (the slant parallelogram) and faithfully copied the 1975 Huret Duopar, a derailleur that I personally detested for its fragility and dishonesty - it promised so much and delivered so little.

The design did have some interesting details. SunTour had adopted a ‘Light Action’ style sprung cable clamp (in imitation of one of Shimano’s better features). They had also used their infamous guide-pulley-with-an-internal -spring design. True to form this example, which is otherwise completely workable, has a totally destroyed guide pulley.

Despite these details, SunTour’s decision to adopt this geometry was like the director of ‘ER’ deciding steal the script of ‘Holby City’.

  • Derailleur brands: SunTour
  • Categories: SunTour - Frank Berto and the curse of Duopar
  • Country: Japan
  • Date of introduction: 1982?
  • Date of this example: 1982 (two letter date code is YG)
  • Model no.: 4600
  • Weight: 305g
  • Maximum cog: 26 teeth (hanger 27mm or less) or 28 teeth (hanger 29mm) (Source: SunTour)
  • Total capacity: 28 teeth (Source: SunTour)
  • Pulley centre to centre: 61mm
  • Index compatibility: friction
  • Chain width: 3/32”
  • Logic: top normal
  • B pivot: unsprung
  • P pivot: two, both sprung
  • Materials: largely steel with aluminium knuckles

Browse associated documents.

SunTour Bicycle Equipment Catalog No. 61

SunTour Bicycle Equipment Catalog No. 61

  • Publisher: SunTour
  • Date: 1983
  • Derailleur brands: SunTour
  • Derailleurs: too numerous to mention - please see the individual pages
SunTour Bicycle Equipment Catalog No 61 - Front cover thumbnail