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i am looking at the XD hoss wheel and 4wp has two specs listed * Back Spacing = 5.18 in. * Offset = 30 mm. * Hub Bore = 125.5 * Finish = Black and this one * Back Spacing = 5.70 in. * Offset = 18 mm. * Hub Bore = 125.5 * Finish = Black which is better for 38x15x18 inch tires and there both 18x9
You'll want the smaller backspacing to stay closer to stock and keep it from sticking out too much, but then you may have rubbing issues on the leaf springs. 15" is an awfully wide tire, if it were me I'd get the lower backspace and a narrower tire.
The KMC Hoss is also available in a 20x9 with -12mm offset (4.53" backspacing) which is more appropriate for lifted applications. I do agree though that the 20x9 Hoss will be too narrow for a 38/15.5.
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