That seems large to me as well. I do not have a Lexa. I have an older Trek road bike. A Trek 2000 (about an 8 to 10 year old men's bike) that is a 47cm frame and my new bike (also a men's frame) is a 48cm Felt F5. My inseam is about 27 inches, although I have a bit longer torso, hence my better fit on men's frames. To me the 47cm Trek is the correct size. I did test a 47cm Lexa and felt the standover height was ok, but felt cramped with the tightness of the handlebars and the top bar length. For me the Cannondales are all have too high of a standover height.