Hi, I have found that bikes these days are getting more and more scrunched together feeling. It seems to me that the bikes of my youth (some 35 years ago) were larger, or at least the space between the tires was more. Now when I go to look at bikes in the store (or look for used ones online) they are all different frame sizes. I am a fairly tall female and I prefer a larger bike because I like to stretch my legs, so what frame size would you recommend? I'm wanting a women's bike over a men's because it isn't as easy for me to swing my leg over anymore, but it seems to me there are some out there that are more or less unisex. Is this true? And wheel size. There seems to be different wheel sizes too. Is a larger wheel easier to pedal? Suggestions?