Whoops, let me try that again. Your stock tire is 25" according to Miata calculator, which would be about 178.5 pixels in diameter on that photo you wanted to use (assuming the length in the specs really is bumper to bumper). Your new tire is 26.3", which would be 187.8 pixels. The tires in that picture are 190 pixels or so (angled view of them made measuring precisely a little tough), so I'd say that the tires in that image are already just about the right size visually. Must be the 16" wheels. To double check we're talking about the same picture:
http://z.about.com/d/cars/1/0/5/0/1/...abbit_side.jpg
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Main Entry: co de pen dence - see codependency
co de pen den cy
Pronunciation: \kō-di-ˈpen-dən(t)-sē\
Function: noun
Date: 1979
: a psychological condition or a relationship in which a person is controlled or manipulated by another who is affected with a pathological condition (as an addiction to alcohol or heroin) ; broadly : dependence on the needs of or control by another
theholycow 
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