DISRAELI GEARS

Cyclo Standard

Cyclo Standard derailleur main image

The Cyclo Standard was the definitive touring derailleur for many decades. It started life as the French 1923 ‘Le Cyclo’, designed and manufactured by Albert Raimond. The design of the mechanism was said to have been inspired by machine guns that Raimond examined during the First World War. In 1932 the British Cyclo Gear Company was established by Raimond and Louis Camillis, and the Cyclo Standard was its first product.

The Standard mounts under the chainstay and is controlled by two cables. The cables rotate a sleeve with a helical groove in it on a shaft with a pin sticking into the groove. One cable pulls the sleeve one way, the other pulls it the other way. As the sleeve rotates the helix drives the sleeve along the shaft. The pulley cage is attached to the sleeve, with the top pulley concentric with the shaft. Chain tension is provided by a spring attached to the eye on the arm that is just above the guide pulley. The other end of the spring is attached to a clamp on the chainstay just behind the bottom bracket.

The Cyclo Standard was heavy and was fiddly to set up, but once properly installed, it was strong and reliable. It can make a decent claim to being the first derailleur that was a practical, commercial, mass-produced product.

You saw these derailleurs in use on tandems in the UK well into the 1970s. One of my ‘Derailleurs that changed the world’.


  • Derailleur brands: Cyclo Gear Company
  • Country: UK
  • Date of introduction: 1932
  • Date of this example: 1949? (the arm is stamped ’49’)
  • Model no.: unknown
  • Weight: 398g including mounting bracket but excluding chain tension spring and chainstay clip
  • Maximum cog: 26 teeth (Cyclo Catalogue - 1949)
  • Total capacity: 34 teeth?
  • Pulley centre to centre: 75mm
  • Index compatibility: friction
  • Chain width: 1/8”
  • Logic: operated by two cables with no ‘normal’ position
  • B pivot: one sprung pivot
  • Materials: steel
Cyclo Standard derailleur additional image 01

Browse associated documents.



French Patent # 615,017

French Patent # 615,017

French Patent 615,017 - Le Cyclo thumbnail


UK Patent # 457,480

UK Patent # 457,480

UK Patent 457,480 - Cyclo Standard thumbnail



Cyclo Catalogue 362 page 17 - scan 18 of 42

Cyclo Catalogue 362 page 17 - scan 18 of 42

Cyclo Catalogue 362 - page 17 thumbnail







Cyclo catalogue 399

Cyclo catalogue 399

Cyclo Catalogue 399 - front cover thumbnail



Cyclo Order Form

Cyclo Order Form

Cyclo Order Form thumbnail


UK Patent # 576,947

UK Patent # 576,947

UK Patent 576,947 - Cyclo prototype thumbnail






Cyclo catalogue 50/A

Cyclo catalogue 50/A

Cyclo Catalogue 50-A - front cover thumbnail


Cyclo catalogue 504

Cyclo catalogue 504

Cyclo Catalogue 504 scan 1 thumbnail


Cyclo catalogue 519

Cyclo catalogue 519

Cyclo Catalogue 519 scan 1 thumbnail


Cyclo catalogue 531

Cyclo catalogue 531

Cyclo Catalogue 531 scan 1 thumbnail


Cyclo catalogue 559

Cyclo catalogue 559

Cyclo Catalogue 559 - front cover thumbnail


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