I was looking at AFS Wheels and their tire and wheel packages. I contacted them through email asking if they would substitute 245/255 for 235/275 tires. Their response was that 275s would not fit on a 4 lug rim. I dont understand that. I thought that the tire size depended on the width of the rim. From reading peoples sigs and other post it seems like 275 should be fine for a 17x9 rim. What gives?

That's funny. I have another thread that I started about what size tires and brand, so I think I might actually go 265 now just for better fit, but its not in stone