So far, my experience in "measuring a bike" for me has been limited to dragging it off the shelf at my LBS and sitting on it. While the tech may can help me get the right fit, he can't be there to size a vintage bike I want to modify. I've been mostly "street and trail" riding mountain bikes, but am eyeballing one I am wanting to put "ram's horns" and (I think it's called) an aerobar, where my elbows go near the steering mount and my arms extend forward. I'm 6' with 32" pants inseam btw.