That's a good point. I guess that it's better to err on the side too much backspace, then use spacers to correct, if necessary.
I have stock brakes and intend to upgrade to a big brake setup in the next year or so. I've read concerns about brake hats offsetting wheels outward.
I'm planning 335/30-18s with a 26" diameter. That diameter clear the mufflers, but not the muffler hangers.
It sounds backspace of 6.5 to 6.75 is typical.
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