More Information in relation to factory diameter tire sizes

[cmcd1984]

SIZE DIAMETER("/%) WIDTH("/%) MPH Difference

215/45R18 25.62"/+0.0% 8.46"/+0.0% +0
225/40R18 25.09"/ -2.1% 8.86"/+4.7% -1/-2
225/45R18 25.97"/+1.4% 8.86"/+4.7% +1
235/40R18 25.40"/ -0.8% 9.25"/+9.3% -1
245/40R18 25.72"/+0.4% 9.65"/+14.0% +0

Next closest overall tire diameter size would be a 275/35R18 at 25.58"/-0.2% difference from factory. Options are going to be difficult with the lack of wheel flare but i'm sure someone is already thinking about how to make more room. Hope this helps everyone.

[CarGuy]

It's not so much the wheel flare from my understanding but the clearances on the inside with suspension which comes into play with wheel width. Remember it has a 2" shorter track than the Evo and shares similar, if not the same track as the GTS.