DISRAELI GEARS

IRCOS New Success?

IRCOS New Success? derailleur main image

This is a 1994 Sachs New Success branded as IRCOS. It is a tidy, competent item. But perhaps rather out of date.

IRCOS did not acquire the lucky bag of old Sachs (or Sachs-Huret or even Huret) factories until 1999. At this point it was a no-name contractor dedicated to supplying SRAM. SRAM did not terminate its contracts with IRCOS until 2001 - so I have guessed that this derailleur dates from 2001. By this time its design was rather long in the tooth. For example, it is an 8-speed model and the 1996 Shimano Dura-Ace (7700) was already a 9 speed.

The logo on this derailleur was trademarked in 1999.


  • Derailleur brands: IRCOS
  • Country: France
  • Date of introduction: 2001?
  • Date of this example: unknown - it is marked 'W5' on the inner pulley cage plate
  • Model no.: RN500? - a guess based on the Sachs number
  • Weight: 228g
  • Maximum cog: 32 teeth - stamped on the cage
  • Total capacity: 28 teeth - stamped on the cage
  • Pulley centre to centre: 50mm
  • Index compatibility: 8-speed
  • Chain width: 3/32”
  • Logic: top normal
  • B pivot: sprung
  • P pivot: sprung
  • Materials: aluminium with titanium pulley bolts
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