Originally Posted by
Kapusta
If you want to use the old "X number of inches of standover" or "handful of exposed seatpost" you are still welcome to do that.
If you add an imaginary horizontal top tube to the frame, that old "
fist full of seatpost" method still works pretty well. My bike (56cm), fit to me (5'11"), with a fat fist full of seatpost above the imaginary top tube: