Old-fashioned women's style bikes have the top tube running parallel or downwards next to the downtube.
I've wondered, how does this affect the riding/function? I imagine it's less strong, being not a triangle, but that is rarely a real concern. Is there more vibration in the front because it's connected on a narrower set of tubes?
I'm sure there's a difference in feel or function, because otherwise it'd seem that a sloping top tube would make more sense for all bikes practically, because then anybody could use almost any bike and not worry about standover height.
(My inseam is ~ 28 which is why I'm so concerned with bike sizes)