I started riding back around 1980. I knew nothing about cycling. So, I bought Greg LeMond's book. In it, and other books, I read two things that still ring true. The first is that there are a range of frame sizes that can work. The French, Competitive and Eddie fits. The second is that the way to get into that range is to measure your inseam...socks w/no shoes...convert to cm and multiply by .667. That will give you your base frame size when measured Center to Center. Funny how it still works for me.