Hi everyone, first time poster, long time lurker with a conversion question. With a 42.2mm chainline, my '82 Marinoni road frame has less than 1/2 mm of space between a 50t chainring and the chainstay. I think this will definitely rub after the powdercoat goes on, so I am going to go with something smaller. Can anyone say offhand whether a 48t ring will give enough room? I am asking because I really like 48*18---two even numbers (for good wear), lots of teeth (ditto), and 70 inches (the gear inch of champions). I am ordering chainrings off the web and I want to get my bike on the road fast, so I would like to get something I for sure won't have to return. If no one knows, maybe I will just go ahead and do something with a 46 or 44.