Looking at that first image of the frame there looks like there's a small wheel on the back of the seat tube. This is so you can run the cable down, around this cable and back up to the derailleur, so allowing you to use a bottom pull deralieur. They don't work so good, but they do work we'll enough in my experience. If you haven't got a fd yet the by all means get the top pull, but just in case
Like this
I have no clue about cx tyres however, try the cx thread
Looking at that first image of the frame there looks like there's a small wheel on the back of the seat tube. This is so you can run the cable down, around this cable and back up to the derailleur, so allowing you to use a bottom pull deralieur. They don't work so good, but they do work we'll enough in my experience. If you haven't got a fd yet the by all means get the top pull, but just in case
Like this
I have no clue about cx tyres however, try the cx thread