One other consideration is that tires back in the 80's and 90's often measured small, like a 700x28C might actually measure 24mm, or a 700x25C might have only been 21mm! Nowadays, tires measure truer to their nominal size, so the crusty old tires on the frame (or the "700x25C" Specialized Turbo listed in the catalog) might not be a good indication what'll actually fit now...