DISRAELI GEARS

Campagnolo Euclid (M010-MD 2nd style)

Campagnolo Euclid (M010-MD) derailleur main image

For 1990 the Euclid derailleur gained a cable adjuster and a smooth allen key cable clamp bolt. This is a rather pleasant medium cage example, although it still weighs a chunky 300g.

One unusual feature is that it sports Campagnolo's full ball-bearing pulley wheels in white. I am not entirely sure that these are original, although I have seen a number of other Euclids of various sorts with these pulleys.

Some relevant details are:

  • There is a spring adjuster on the p-pivot.
  • The cable adjuster is round and threads straight into the aluminium of the b-pivot.
  • It has a single parallelogram spring using ~2.0mm wire.
  • The inner parallelogram plate is an aluminium forging (making this a Euclid rather than a Centaur !?).
  • The cable clamp nut is a smooth Allen key item.
  • The pulley wheels are full ball-bearing items in white.
  • The inner pulley cage plate is steel and has a spoke deflector.


  • Derailleur brands: Campagnolo
  • Categories: Campagnolo - mountain bike madness
  • Country: Italy
  • Date of introduction: 1990?
  • Date of this example: unknown
  • Model no.: M010-MD
  • Weight: 300g
  • Maximum cog: 34 teeth (Campagnolo)
  • Total capacity: 38 teeth (Campagnolo)
  • Pulley centre to centre: 69mm
  • Index compatibility: 8 speed
  • Chain width: 3/32
  • Logic: top normal
  • B pivot: sprung
  • P pivot: sprung
  • Materials: aluminium with a steel inner pulley cage
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