Many thanks Oscar and Dirk for all this great PX-10 and PY-10 information.
I just have a boring run-of-the-mill 1972 PX-10e, but it's simply the most delightful machine to ride out there. Just what was the secret here? Frame angles? I assume this is 72 parallel (French cycle maker never seem to mention this essential unlike the British). But now I can see why this was a TdF champion for so long... is there another bicycle that has that perfect combination of handling (well she's a little "whippy"), ride, lightness and responsiveness? You could race this all day. And I have to say that the delrin Simplex derailleur is the smoothest, quietest shifter one could hope for. Just a bloody marvelous machine. How they sold this for $240 (I seem to recall that was the price in the early '70s) is beyond me... it was a bargain back then.
Je t'aime mon Peugeot!
Washington DC USA