Originally Posted by Danhedonia

I think sizing is more personal; I have a Giant TCR-1 (an '06) that says "L" and the size is 56. I'm 5-10, but can't ride anything smaller without having comfort issues.

Height is far from the only significant stat. Are you long limbed? That will definitely change what you find "fits." And some people like to feel more stretched out on a bike, some like to be in a more compact position. As always, YMMV.

If the bike feels too big, than perhaps it is. For you. Play with the seat position, adjust the handlebars, see what you come up with.