DISRAELI GEARS

Bridgestone Klimatic (1st style)

Bridgestone Klimatic derailleur (1st style) main image

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.


  • Derailleur brands: Bridgestone, manufactured by SunTour
  • Country: Japan
  • Date of introduction: 1982?
  • Date of this example: 1982 (two letter date code is YI)
  • Model no.: unknown
  • Weight: 389g
  • Maximum cog: 28 teeth?
  • Total capacity: 28 teeth?
  • Pulley centre to centre: 57mm
  • Index compatibility: 5 speed?
  • Chain width: 3/32”
  • Logic: top normal
  • B pivot: three pivots, the rear unsprung, the other two sprung
  • Materials: largely steel with aluminium knuckles
Bridgestone Klimatic derailleur (1st style) additional image 01
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