This ZZR is a carbon copy of a Simplex Juy-51 - a design that uses two cables - one to tension the spring. This ZZR has all the Simplex features including the legendary ‘Get-You-Home patented gear selector’, that allowed you to trap the toggle chain if the cable snapped.

Despite all this exceedingly faithful copying, the ZZR still lacks the finish (and touch of bling) that lends the Simplex a modicum of period charm.

I have photographed this example with the top knuckle spring disengaged - to allow the derailleur to take up a more normal position.

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1. •Brand: ZZR
   

2. •Country: Poland
   

3. •Date of introduction: 1959?
   

4. •Date of this example: unknown
   

5. •Model no: unknown
   

6. •Weight: 271g including hanger plate, but excluding drop out bolt
   

7. •Maximum cog: 26 teeth
   

8. •Total capacity: 20 teeth
   

9. •Pulley centre to centre: 44mm
   

10. •Index compatibility: friction
    

11. •Chain width: unknown
    

12. •Logic: low normal
    

13. •Pivots: two sprung pivots
    

14. •Material: steel, with aluminium pulley cage plates
    

0390/N