Doesn't meet your offset needs but I like these:I'm having a hard time finding 18" wheels with the right load rating and offset. I don't want a higher offset than +30, and I think the minimum load rating should be ~750kg.
Any ideas? Best I found are Black Rhino wheels, but they have a +10 offset which is little too pokey and might rub with 245/60.
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Don't look tucked in with 255/55-18s.