SunTour V (2900)

SunTour V derailleur (2900) main image

With the third iteration of the V series SunTour defined the look and performance of derailleurs for the next 30 years. All the elements are here: the curvaceous cast aluminium knuckles, the slant parallelogram, the adjustment screws (clearly marked ‘H’ and ‘L’) at the back, the adjustable cable outer stop, the cable clamped under a washer by a bolt, and the final element - big, glossy, chromed allen bolts.

The V was a tolerable weight, astoundingly affordable and frighteningly effective over a close ratio freewheel - all it lacked was an Italian pedigree.

  • Derailleur brands: SunTour
  • Categories: SunTour - the V story
  • Country: Japan
  • Date of introduction: 1970?
  • Date of this example: unknown (no two letter date code, but both pulleys and parallelogram plate are stamped ‘Maeda Industries Ltd.’)
  • Model no.: 2900 (and also 2900/1)
  • Weight: 270g
  • Maximum cog: 24 teeth (source: SunTour)
  • Total capacity: 24 teeth (source: SunTour)
  • Pulley centre to centre: 46mm
  • Index compatibility: friction
  • Chain width: 3/32”
  • Logic: top normal
  • B pivot: unsprung
  • P pivot: sprung
  • Materials: largely aluminium with steel parallelogram plates