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Originally Posted by drburton
Be careful with how the width impacts the circumference of the tire. If you go wider you generally need to have a shorter sidewall. So in the rear, you should probably go with a 275/35/18.
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Actually, you want to keep the same sidewall height, independent of tire width. In some cases that means going to a smaller aspect ratio.
In the case of a change from a 265/40-18 (~12.54" radius), the closest match is a 275/40-18 (~12.68" radius) which is a 1.1 % increase in rolling radius. A 275/35-18 would get a ~12.22" rolling radius, or a reduction of 2.55%.