So I think I can run 15x7 ultraleggeras with a rt660 225/45zr15 with my suspension as it is. Keyword is I think haha. With this setup, id lose 9 pounds per corner and gain a lot more footprint assuming I kept the tire pressure on the low side. Right now I'm running ecsta pa51s 205/40R17. I think this should improve my footprint quite a bit. Although, would it be better to save the extra 2 lbs and get the 205s? They only come in those 2 widths for 15s.