Sun-Bow derailleur main image

This Sun-Bow is a gruesome, Frankenstinian copy of an early SunTour Honor.

It has the folded steel knuckles, the ribbed black plastic spring cover and it has a jockey wheel that can be removed with a (plastic) wing-nut - all of these echo SunTour features of the late 1960s and early 1970s. Most disturbingly it has a slant parallelogram - but the slant is so slight that you can barely detect it - perhaps Sun-Bow were hoping that it would pass unnoticed by SunTour’s eagle-eyed patent attorneys.

What the Sun-Bow conspicuously lacks is any sense of composition, coherence or quality, which is strange because these are exactly the qualities that marked out Japanese derailleurs of the time.

  • Derailleur brands: Sun-Bow
  • Country: Japan
  • Date of introduction: 1977?
  • Date of this example: unknown
  • Model no.: unknown
  • Weight: 399g including hanger plate, but excluding the drop-out bolt
  • Maximum cog: 28 teeth?
  • Total capacity: 28 teeth?
  • Pulley centre to centre: 55mm
  • Index compatibility: friction
  • Chain width: 3/32”
  • Logic: top normal
  • B pivot: two pivots, front sprung and rear unsprung
  • Materials: steel
Sun-Bow derailleur additional image 01

Browse associated documents.

Japanese Patent # S54-57737

Japanese Patent # S54-57737

Japanese Patent S54-57737 thumbnail
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