This is probably a pretty simple question, but I'm unsure - I want to replace the old derailleur cables my 89 Bianchi Giro (DT shifters) and I'm not sure if I should use cables with or without housing. I know that originally, the cables were just routed under the bottom bracket without housing, presumably with some grease underneath to cut down on friction. Is that still the way I should do things, without housing?