DISRAELI GEARS

Bridgestone SMS Max

Bridgestone SMS Max derailleur main image

The Bridgestone SMS Max was Bridgestone's second attempt at indexing a 5 speed derailleur. Compared to the earlier Bridgestone Synchro Memory Shift, the cylinder that contains the indexing cam has been reduced in size (from 36mm to 30mm diameter) and the b-knuckle is geometrically simpler to manufacture, fits a conventional Campagnolo drop-out and incorporates a high and low gear stop screw (which were missing from the Bridgestone Synchro Memory Shift).

However, although this contraption was manufactured by SunTour, it remains very unlike most contemporary SunTour designs - the parallelogram is not slanted, the p-knuckle looks very Shimano-like, and, on this short cage version, the pulley cage is wildly offset.


  • Derailleur brands: Bridgestone, manufactured by SunTour
  • Country: Japan
  • Date of introduction: 1979?
  • Date of this example: 1981 (two letter date code is XL)
  • Model no.: unknown
  • Weight: 450g including hanger plate
  • Maximum cog: 30 teeth?
  • Total capacity: 28 teeth?
  • Pulley centre to centre: 54mm
  • Index compatibility: 5 speed
  • Chain width: 3/32”
  • Logic: top normal
  • B pivot: two pivots, front sprung and rear unsprung
  • Materials: steel
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