'The Sirius is made of some species of double-butted chromoly, which is fine by us. The profile of the frame is nothing terribly out of the ordinary, but then there's not all that much you can do with a bunch of steel tubes really. The head tube is ring-reinforced at the ends (and carries a distinctive "PD" head badge), while the sloping top tube meets the seat tube just below the seat stays...' More
