I don't know generalities, but I certainly have longer legs than most men my height. But I also have ridiculously long arms and a long torso. I ride unisex frames and at 5'7", generally start by looking at a 54cm (or 52 for cross) and work from there. My little sister, same height as I am but completely different build, rides a 51cm WSD. So there really is no right or wrong answer. Go with what works