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I'm guessing your wheels are 8 inches wide?


Yes, 8" wide. Stock backspacing (around 4.5 - 4.75").
I'd probably be better off with 7" rims, still stock backspacing. With 8" rims I have a problem with mud getting packed between the bead and rim, resulting in slow leaks.
A narrower rim might help prevent this, or, maybe not...