I'm not asking about some specific frame. I'm asking about a type of frame that I've seen. My old bike had it, my friends bike has it. On my current bike, my top tube and bottom tube are both equal. They're both thin. But on my friends bike and my old bike, the top tube is thin and the bottom is fat and thick. (no homo) Is this something about cheaper bikes? Its just that both of those bikes were under 300 and my bike that has the normal frame is over 500.