All this has been quite informative! I have a related question: is there any disadvantage/safety concern with going to a much wider rim than the tire size would justify? By way of example, I'm going to 275's when the stock Duelers are worn out (not long now!), and I was debating on staying with the stock rims, or moving up to a 9" rim. I want to have the flexibility to move up to 285's down the road and have the right rim. But I won't do that if there's a problem with smaller tire on bigger rim (besides looking a little funny). sorry for the thread mini-derail...