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Yes, it would be out of whack (is that the technical term?) :p

Check out the following calculator:
http://www.miata.net/garage/tirecalc.html

I just did it (assuming stock 215/50/17 size) and that size would show your speedometer at 5.6% too fast - that's really pretty big. Plus, you'll be racking up miles 5.6% faster than you really are.

225/45/17 would be a better choice. Try putting different sizes into the calculator to see what matches most closely.
 
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