DISRAELI GEARS

Eugen Allmendinger full-carbon prototype

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105g! The headline news about this brandless, generally anonymous object is that, at 105g, it is the lightest derailleur in this collection.

I know very little for certain about it. However I have a number of, slightly vague, beliefs about it, as follows:

  • It was probably created by Eugen Allmendinger, a prolific patenter of designs for bicycle parts, in the town of Biberach, in southern Germany.
  • It may have been sold by a company called Bike-Tuning-Parts (BTP), owned by Bernhard Langerbein, in Hamm in the Ruhr. Similar derailleurs were sometimes referred to as 'BTP' derailleurs.
  • Another company, possibly called Carbon Crew may also have sold these derailleurs - or been involved in some way. You sometimes see references to 'Carbon Crew' derailleurs.
  • At some point in the early 'noughties' Eugen Allmendinger started to work with Lightweight, and this design formed the starting point from which the Lightweight derailleur was developed.

I have not used this derailleur in anger, but to my eye it looks rather fragile and slightly inaccurately made. I can see why Lightweight reworked and professionalised the design. I can also see why they let the weight rise marginally to 120g for their production model.

The adjustment screws look very odd but may be original. I have seen photos of other examples which have these incongruous screws. But who knows exactly what is original on a near-one-off like this - perhaps only Eugen Allmendinger himself.


  • Derailleur brands: Lightweight
  • Themes: Ultra-lightweight - road racing models
  • Country: Germany
  • Date of introduction: 2003?
  • Date of this example: unknown
  • Model no.: unknown
  • Weight: 105g
  • Maximum cog: unknown
  • Total capacity: unknown
  • Pulley centre to centre: 60mm
  • Index compatibility: 9 speed?
  • Chain width: 3/32”
  • Logic: top normal
  • B pivot: sprung
  • P pivot: sprung
  • Materials: carbon fibre composite
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