I chose to open the thread here and not in track/ss forum because i believe this has to do more with vintage bike geometry than track bikes in general....of course I could be wrong
So, I recently bought a vintage track bike (80`s?) based on poorish pictures, however I could see that based on the head tube length that it should be my size. And I was almost right:
the head tube being 16.5 cm. However the rest of the bike is strange to me: 55 cm seat tube (c-t) pared to a 53 cm top tube (c-c). Now, the two reference vintage bikes of mine that i ride are both
60 cm seat tube with 58 cm top tube and 17 cm head tubes and that looks "normal"to me...

Or maybe the bike was built for something else and is not a conventional track bike? Both wheels a re 27 inch btw. Any ideas?