Shimano 600 GS black (6101)

Shimano 600 GS black derailleur (6101) 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, black, version of the second generation which have 6100 model numbers. The distinguishing feature is that the ‘600’ on the outer parallelogram plate is in small script - I have never been able to detect if there were any more substantive differences.

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.

The 6100 series of Shimano’s 600 groupset was the first to sell in quantity in Britain. It feels like an old friend!

  • Derailleur brands: Shimano
  • Categories: Shimano - the Ultegra story, Shimano - the Deore XT story
  • Country: Japan
  • Date of introduction: 1976
  • Date of this example: 1977 (two letter date code is BI)
  • Model no.: 6101
  • 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

Browse associated documents.

Shimano exploded views - 600 (before Ultegra)

Shimano exploded views - 600 (before Ultegra)

  • Publisher: Shimano
  • Date:
  • Derailleur brands: Shimano
  • Derailleurs: too many to list here
Shimano Bicycle Parts - 1978 scan 11 thumbnail