Shimano 600 GS (6001?)

Shimano 600 GS derailleur (6001?) main image

The early Shimano 600 derailleurs were revolutionary in a number of ways. They were part of a full groupset - a new phenomenon for a mid level price point, they were designed for Campagnolo drop-outs (gone was the homage to Simplex), and most important of all, they were well finished and looked ruthlessly composed and modern. I can well remember marvelling at the sheer glamour of mid-range bikes kitted out in the full 600 groupset - they looked so much better than their peers clad in a mishmash of Weinmann centre pulls, SR cranks and SunTour V series gears.

This example is a long pulley cage version of the very first generation which, I have been told, have 6000 model numbers (which makes sense - but I have never seen these numbers in a catalogue). The distinguishing feature is that the ‘600’ on the outer parallelogram plate is in large script.

All in all, a pretty damn fine derailleur - even if it did not change quite as well over a wide ratio freewheel as a SunTour Vx GT.

  • Derailleur brands: Shimano
  • Categories: Shimano - the Ultegra story, Shimano - the Deore XT story
  • Country: Japan
  • Date of introduction: 1974
  • Date of this example: 1975 (two letter date code is ZE)
  • Model no.: 6001?
  • Weight: 250g
  • Maximum cog: 34 teeth (Sutherland’s 6th edition)
  • Total capacity: 34 teeth
  • Pulley centre to centre: 75mm
  • Index compatibility: friction
  • Chain width: 3/32”
  • Logic: top normal
  • B pivot: sprung
  • P pivot: sprung
  • Materials: largely aluminium, steel pulley cage plates