DISRAELI GEARS

Altenburger S-O

Altenburger S-O main image

This, first, Altenburger design was a cleaned up version of the design covered in the patent that Altenburger bought from Cervino. Altenburger dispensed with the double cable mechanism, introducing a single cable working against a spring.

It is a rigid, well made, derailleur that mounts under the chainstay. The top sprocket stop is not adjustable - it is just a flange that stops the movement of the rod. The low sprocket stop is a small cylinder that clamps on the cable - you can see this in Altenburger's patent.

The way that the chain tension spring is hidden inside the tube, and pulled by a toggle chain (see photos), is devastatingly cunning but strangely unneccesary.

Finally, the patent shows an adjustable cable outer stop - which is not the case with this example.


  • Derailleur brands: Altenburger
  • Country: Germany
  • Date of introduction: 1951?
  • Date of this example: unknown
  • Model no.: unknown
  • Weight: 216g including fixing plate, but excluding frame fixing bolts
  • Maximum cog: unknown
  • Total capacity: unknown
  • Pulley centre to centre: 41mm
  • Index compatibility: friction
  • Chain width: 1/8”?
  • Logic: top normal
  • B pivot: none
  • P pivot: sprung
  • Materials: steel
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Browse associated documents.



Altenburger - instructions

Altenburger - instructions

Altenburger derailleur - instructions scan 1 thumbnail


German Patent # 858,934

German Patent # 858,934

German Patent 858,934 - Altenburger thumbnail
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