So the drama started when I decided to get a Ridley cyclocross bike. I thought long and hard about the best bike to get. In the end, how can you go wrong with a Belgian bike for cross? My normal frame size is a 53-54. After countless measurings, much research, several sleepless nights, and a phone call to Ridley I decided they must be right...a size 54 Ridley frame would be way to big. So I ordered a 48! A 48! I still can't believe it...though it makes sense based on how they measure it.
Check out this .pdf on Crossbow geometry.