I can't speak to the sizing issue since I am 5'9" or so. The 54cm frame fits me more or less perfectly, though. I must say that I still LOVE this bike! The odometer just ticked over 5000 miles this weekend and I have had relatively few troubles with it--and I'm not all that gentle with it. I've replaced the Cassette once and the shifter cables as well. It is versitile and strong, so you can ride just about anywhere on it. All I can say is ride one and see if it works for you.