On some 80's Peugeots you can find the size info typed on a small paper label affixed to the chainstay or to the underside of the bottom bracket shell (see the "63" typed on the tag on the blue example below). That info should match the "Center to Center" dimension that [MENTION=190364]lostarchitect[/MENTION] posted above.
Attachment 596601
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Last edited by Hudson308; 01-23-18 at 11:27 AM.