Basically, it says you can go for 3 different bike sizing methods: competitive, traditional and French. Although the competitive method suggests something like a size down from what you'd normally go for, I think a 54cm for a person of 6 foot is slightly too small even for this.
This site has some interesting info on bike sizing.
http://www.competitivecyclist.com/
Basically, it says you can go for 3 different bike sizing methods: competitive, traditional and French. Although the competitive method suggests something like a size down from what you'd normally go for, I think a 54cm for a person of 6 foot is slightly too small even for this.