True, and for that response, I thank you. I asked my friend that has been working at bike shops for 15 years, and he said pretty much the same. He recommended to go with a 56.5 when he measured me.

The Gitane that I have been riding is a 60cm seat tube and 59cm top tube is very comfortable for me. Since that is a few centimeters larger than the TT I thought (granted without a strong basis) that a 57cm would be okay.