im 511 and i ride the 2007 medium, its a good fit. in 2006 the meduium in toptube is now the large, and the 2006 small is the now the 07 medium.(This is what my lbs told me) if your under 5,9 or just like really small bikes go for the small other wise get the medium
6'1" and I rode a Medium, Large is not only 1" longer in the top tube, but the wheelbase is also quite a bit longer, which is no good when you get into the tight stuff. I just ran the bike with a 60mm stem and really loved the size, any bigger would have been no fun at all. I really think the Large should be for guys that are 6'3"+ or someone with really long arms and long torso.
6'1" and I rode a Medium, Large is not only 1" longer in the top tube, but the wheelbase is also quite a bit longer, which is no good when you get into the tight stuff. I just ran the bike with a 60mm stem and really loved the size, any bigger would have been no fun at all. I really think the Large should be for guys that are 6'3"+ or someone with really long arms and long torso.