The size of the rim won't matter as much as the size of the tire.
You won't have any issues (besides a harsher ride) as long as you stick with a tire that is the same height. IIRC, a 245/40/18 is approx. 25.6" tall, and would fit on an 18x8 rim.
- Justin
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1999 Camry - Beigemobile DD
2002 Suburban - Wife's DD
2004 Grand Cherokee - Not running / Project / Selling?
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