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.

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1. •Brand: SunTour
   

2. •My category: SunTour  - indexing insanity
   

3. •Country: Japan
   

4. •Date of introduction: 1985?
   

5. •Date of this example: 1985 (two letter date code is BH)
   

6. •Model no: SR21
   

7. •Weight: 328g
   

8. •Maximum cog: 32 teeth?
   

9. •Total capacity: 34 teeth?
   

10. •Pulley centre to centre: 65mm
    

11. •Index compatibility: 5 speed?
    

12. •Chain width: 3/32”
    

13. •Material: aluminium knuckles, steel parallelogram plates and pulley cage plates
    

0325/K