I have a set of 18" wheels, 8.5" in front and 10.5" in the back, presumably with standard Boxster offset, although I've not measured them.
The additional width is mostly because of a "lip" to the outside of the wheel. You can see it, particularly on the rear wheels, in the picture, above. No problems with rubbing, etc.
I'd tell you what brand they are, but I have never been able to find any identifying mark(s), so I don't know. They are a single-piece alloy wheel, Sport Design style, but not factory wheels.
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