Have you not payed attention?
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As for the additional tire size question, had you have plugged the figures into a tire size calculator, you would have found that they are smaller in diameter than stock so scrubbing won't be a problem. The tire size calculator will however tell you that there is a potential problem.
To reply. NO
I did check with 1010tires and the minimum for 235/40R18 was 8" wide so i thought 7.5" may be a problem. Going with 225/45R18 would cost me an extra $160 per tyre on top of the 235/40R18.