Our guide indicates that you can run up to a 255 width on an 8.5" wide wheel that has an offset between +33mm to +49mm. The 255/40-18 will be agressive since it is taller than the stock size, by about .75". I know a 245/40-18 fits but the 255/40-18 is to close to tell on my end. A test fit should really be done. Since you will be lowering the vehicle, you may want to consider running a 255/35-18. This size will be closer to the OE rolling diameter.
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