Looking at a 1975 Schwinn Le Tour mixte on ebay. The information I have found indicates that the mixte version came in a 19" (L69) and 22" (L72) frame size, but the ebay listing shows the size as "M".
Is there a definitive way to identify the frame size?
What is the "horizontal top tube" length for the L72?
Assuming that the frame size is suitable, would this bike be worth rebuilding / upgrading for casual riding?
Any information / advice would be appreciated.