I'd have to agree. No larger than 235/40 on this wheel size. You're beyond stock diameter anyway.I wouldn't go passed 235/40/18 on a 7.5 width wheel. If you look on tirerack it'll tell you the min and max wheel width for each tire size. 225/40/18 is what I'd recommend.
Not true. 235/40 on mine looks perfect imo. Nice flush sidewall.225/40 on a 7.5 Anything wider than that wouldn't look right anyways.