Geezzz, this is a step into the Wayback machine! The first bike part I ever bought was a Sun Tour V GT RD to replace the Simplex that came on my Atala. Nixon was President....
If you're going to ride this bike I'll agree with the 'replace with Sun Tour' bunch. But if you have to restore the Simplex I'll send you a jockey wheel.
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(who just scrounged a Huret Luxe Super Touring RD to keep his daughter's Ficelle 'all French'. And it needs a jockey wheel, too!