Originally Posted by
saturnhr
Aside your point, if your friend got the wrong bike, I think your measurement of the top tube length in a compact frame bike by your depiction above is not correct, measurement should go to the red line (extension of the seat tube)
I don't know, that bit confuses me, as well. Giant doesn't state if the number refers to the effective or virtual top tube length. That's why I chose compare the head tube length.