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 very interested.
But three features catch my eye:
I think that this particular example is a early version with the following traits: