Originally Posted by onespeedbiker

Agreed, during the 1980's Peugeot transitioned from French to BSC (with a few Swiss) bottom brackets. My 1985 PH 501 had a French fork/stem and BSC bottom bracket (as did most of the 1985 and 1986 Peugeots). A bit of caution, if you are going to switch to a BSC steerer and headset, be aware that the French quill stem is a little undersize for a BSC steerer. While it will fit and tighten up just fine, it will put additional pressure inside the steerer where the split wedge tightens against the inside wall of the steerer tube. I did this on my bike when I replaced the original fork with a BSC fork (and BB). Years later the steerer split along the steerer groove (which in this case extended over where the split wedge was positioned inside the steerer). I still use the French quill stem with a BSC fork, but the fork I am using was cut (and a few threads added) so the groove is very short and does not extend down where the stem split wedge tightens inside of the steerer.