I am 5'3 and don't know what size my bike is but it has a 54 top tube. The one before this one had a shorter top tube and I felt cramped. All I know is that my bike is very comfortable and nothing screams in pain when I ride, so something must be right. I built up the bike myself and will do that from now on. I am not much of an "off the shelf" kinda person.

Brenda