Originally Posted by
ThermionicScott
Nowadays, bikes are more "square" -- a large frame will generally have a top tube that is effectively the same length as the seat tube.
You must be living in 1990
Plenty of sloping top tube bikes aren't close to square.
For instance, Specialized Secteur : seat tube 485mm, TT 565mm. And the top of the head tube is about where a 60cm square, level TT frame's would be.