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Pretty sure Daytons only come in 5in and 6in, unless they've added 5.5 to their line. I have the 6in on my BJ8, and would prefer they be 5.5. Dunlops do come in 5.5 IIRC.
You're right - they're 6" overall width on the outside of the lip around the periphery.
Never thought before about how they measure these - whether it would be the width of the area the tire seats in (evidently not) or the outside thickness of the wheel.