Originally Posted by
elTwitcho
The top tube would be longer, however the head tube would be taller as well. So you would be more stretched out AS WELL as there would be less drop from your saddle to the bars.
This is key here. I have two bikes that are both 58CM C-C, but one has a longer top tube and is comfterable. The other one is shorter, and is very painful to ride for long distances. You can get stems to adjust the height of your bars, but you can't make a too short top tube longer very well.