I have found the tire sizes for the LS in 17-18-19, but have not gotten a firm word on what size to use with 20's so they dont rub ??? Also, what is the widdest tire size we can fit on a 17" rim so it does not rub either. 245/45/17 ??? Thanks in advance for the info.

The size thats recommended for a 20inch wheel is 255/35/20, or a 245/35/20, the 255 size is going to be much cheaper. As far as the 17inch, the fitment guide goes as large as 255/45/17, I would not go bigger than that. Good luck, if you have anymore questions on rims, tire sizes, or anything like that, email or post another question. I work at National Tire and Battery, and deal with stuff like this all day.