He said it was stamped a 56, and the seat tube does measure that, c-c. Unfortunately for me, the top tube is a half inch shorter. I really want to keep the original 3ttt stem and bars with the bike, so this one may be moving on. So gonna keep it low cost. The tubulars will be switched for Record/Mavic clinchers I have. And I have a Record seatpost and down tube shifters for it and a NR rear derailleur. Thinking about black Newbaum's tape and ride for a bit if it'll fit. Maybe put the brake levers lower than I normally would to help with the short top tube.