Have searched but couldn't find a definitive answer. Will the 2010 Roubaix (Comp) fit 28 tires?

I'm looking at similar models of both the Tarmac and Roubaix, both Comps with Rival. I know the Tarmac most likely won't fit the 28s, and the Roubaix would probably be slightly more suited to the newer relaxed position that I'm setting up.