If the Shimano Positron AX was the coming together of Shimano’s disastrous Positron technology with its much sneered at AX aerodynamic design. Then this derailleur was SunTour’s riposte - the coming together of its widely ignored in-derailleur indexing technology, its derided Trimec design and its hopelessly unreliable ‘Tech’ three pivot technology.

And just like the Positron AX, the result of this marriage of monstrosities was a surprisingly solid and workable derailleur. Albeit one that nobody wanted to buy.

I believe that SunTour manufactured the Klimatic range exclusively for Bridgestone - the lucky devils.

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1. •Brand: Bridgestone, manufactured by SunTour
   

2. •My category: SunTour - Frank Berto and the curse of Duopar, SunTour - indexing insanity
   

3. •Country: Japan
   

4. •Date of introduction: 1982?
   

5. •Date of this example: 1982 (two letter date code is YI)
   

6. •Model no: unknown
   

7. •Weight: 389g
   

8. •Maximum cog: 28 teeth?
   

9. •Total capacity: 28 teeth?
   

10. •Pulley centre to centre: 57mm
    

11. •Index compatibility: 5 speed?
    

12. •Chain width: 3/32”
    

13. •Logic: top normal
    

14. •Pivots: three pivots, the rear unsprung, the other two sprung
    

15. •Material: largely steel with aluminium knuckles
    

0073/C