SunTour Scrambler

SunTour Scrambler derailleur main image

With the Scrambler, SunTour introduced yet another mid-end indexing mechanism. This is a system based on an indexed lever, with the rear derailleur merely centred with a single adjusting screw, and with a ‘Light Action’ type spring built into the cable clamp mount. It is possibly the fourth indexing system Suntour introduced within a decade - not a good idea.

Heavy, ugly and not particularly cheap, no one was interested - but the Scrambler’s pulley cage plates have an interesting ninja/sci-fi look and it has an unusual 12 tooth guide pulley.

  • Derailleur brands: SunTour
  • Categories: SunTour - indexing insanity
  • Country: Japan
  • Date of introduction: 1985?
  • Date of this example: 1985 (two letter date code is BH)
  • Model no.: SR21
  • Weight: 328g
  • Maximum cog: 32 teeth?
  • Total capacity: 34 teeth?
  • Pulley centre to centre: 65mm
  • Index compatibility: 5 speed?
  • Chain width: 3/32”
  • B pivot: unsprung
  • P pivot: sprung
  • Materials: aluminium knuckles, steel parallelogram plates and pulley cage plates
SunTour Scrambler derailleur additional image 01