I have read or heard that bike sizing is somewhat different today. For example, I am 5'8" and I ride a 58cm (23") bike. I bought it in 1980 and at the time I was told that with my feet flat on the ground the top tube should touch my crotch or be slightly below. Also the seat post should extend out of the seat tube about the width of your fist. By today's standards, I think this frame would be considered too large for a person my size. The bike is quite comformtable nonetheless. Can anyone confirm that sizing standards are somewhat different today?