Originally Posted by cam2000deluxe
Um, total newbie just thinking about buying a 1st bike but...isn't it easier to fit a longer top tube when the frame is bigger since the seat sits lower relative to the frame/handlebars so the handle bars are easier to reach for a given top tube length?
Yes. Also, head and seat tube angles make a big difference. I have three bikes nominally the same size, but they all fit differently because the top tube lengths and angles are different.