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if you look at tire choices on tirerack for 245's it opens up quite a bit more than even 235's which are a lot compared against 225's and so on
and also the tire size is consistent with the stock tire size where the 225's are a bit off_
I doubt you are going to be able to fit 245's or even 235's without some fender trimming (let alone if you are lowered at all). 225's even seem to rub for some peeps who run them. Of course the offset and whether or not you use spacers will affect fitment also. There are templates out there that can help you see what will fit.
Widths
215 = 8.5 in.
225 = 8.9 in.
235 = 9.3 in.
245 = 9.6 in.