Ah, the 1930s! When derailleur designers adopted a completely new mechanism every other day of the week. The CMP Synchro uses a double cable to rotate a wheel that uses a rack and pinion layout to drive the pulley cage in and out.
It probably worked OK, if you like that kind of thing.
- Derailleur brands: CMP
- Country: France
- Date of introduction: 1938?
- Date of this example: unknown
- Model no.: unknown
- Weight: 264g including 'U' bracket which may not be original, and excluding pulley cage spring
- Maximum cog: unknown
- Total capacity: unknown
- Pulley centre to centre: 67mm
- Index compatibility: friction
- Chain width: 1/8”?
- Logic: no 'normal' state
- B pivot: none
- P pivot: sprung
- Materials: mainly steel with some rather fetching brass small parts
Ref. 1411