These are two kinds of the double chain-ring, and the chain tension device.
Competition was used for three-arm crank.
Tourist was used for five pins crank.
The minimum gear of Competition was 45T, Tourist was 28T.
I had used both models. As for Competition, I had tried to attach it to Stronglight steel cottered-crank.
However, I had to remove it soon because it was not usable.
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These were several products other than derailleur.
There must have been a number of cyclists who had used seat pin, quick shaft, and straight fork end.
As for the fork end of road racing bicycle, The form of the left side was unique.
The quick shaft was so-called vertical type.
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