Originally Posted by Discount Tire
A 20x9 with a 0mm offset will stick out about 3/4" beyond your fenders. A 9" wide wheel with a -18mm offset will stick out about 1.5" beyond your fenders.
Are you sure about that? A 0 offset would be a 5" back space and a -18 would be about 4.25" backspace. The OP said he has an 08 and if I'm not mistaken, the OEM backspace for an 08 is closer to 6". Based on that, a one inch wider wheel (OEM 8 to after market 9) and a an inch less of backspace is going to move the rim lip out 2 inches or 2¾ inches depending on what the OEM backspace is.
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