I was looking through the picture post and noticed that somone had a Lemond road frame with cantilever brakes and called it a cross bike. Don't you need fatter tires to ride on dirt? I am not sure but it doesn't look like you can get much of a tire on the rear of that frame. I don't really know much about Cross so I am just interested. What size tires do people usually run? What can you fit on a road frame like the Lemond?

It wasn't a road frame, most likely. It was a Lemond cx frame called a poprad. Check out the lemond bikes website for more info.