TT Bike Frame Sizes
 

I'm looking at building up a TT Bike this winter and have a few questions about sizes. I've been pro fitted for a road bike and have my size there, but is there a difference when it comes to TT bikes? I would think that you would want a longer top tube than on your road bike so you can lay out farther? So in that logic, say if I have a 53 Road bike, a 55 or 56 might be a good size for a TT? Am I way off here?