Originally Posted by alanbikehouston
Cut a photo of a rider from the 1960's out of a cycling magazine. Draw a line from the bottom of the stem to a point on the seat tube that is six inches below the seat bolt. You now have a bike with a sloping top tube, yet nothing else, including the rider's position has changed.
Your right.. Nothing different about it.
It can be abused in the fitting process, by giving people a bike that would normally be too big for them (but stand over height is ok).