I"m running a backspacing of -6 on a wheel that's 18x8.5 at stock height and I love the look...had to do some minor cladding trim front and rear, but no rubbing issues lock to lock and I have about 1" of tire outside the edge of the cladding.
Dont mean to be nitpicky.. but your running an OFFSET of -6.. backspacing would be about 4 inches
offset is measured from the center line of the wheel, backspacing is measured from the back of the wheel
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