My mid '70s Peugeot AO-8 had all its original Simplex mechs when I got it (mostly for the large frame). I found the Simplex derailleur to shift really well and be a good friction unit for what it was, but the front one cracked, and I broke one of the DT levers. Later I ran it as a fixed gear before donating the frame to the co-op - too many red bikes, not enough green bikes. I want to find a big green or blue frame UO-8, all original with their Simplex mechs. Montreal is the place to find working-man Pugs with the choicest Simplex. I cannot say why I want another lower end French bike in a world awash in C&V 531 frames, but that's not what this thread is about!
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