In sizing a bike one hears a lot the seat tube. A 58cm frame will have a 58cm ST, either center to top or center to center. This seems to have been the standard before the advent of compact geometery.
Correct me if I'm wrong, but now it seems with compact geometery that the top tube is the length to look at when buying a new bike. I've seen some bikes that are listed as "58cm" really being 53cm T-T with a longer TT to compensate.
So, my questions are these; Is the TT the more important feature to look at when buying a new compact frame bike? If so, how does one determin ones TT size?