Bike size/sizing seems to be one of those things that has changed. My new bike was sold as a 61cm, because it measures 61cm from the center of the BB to the top of the seat tube. But it actually measures 58cm from the center of the top tube to the center of the BB, which is the "old fashion" way to measure bikes.

I have always ridden a 57-58 and this bike fits fine, but I have to admit it is weird buying a frame so large. At least BD had accurate geo charts for this bike.