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15mm is the difference in DIAMETER of the TYRE (you know made of rubber).

The overall diameter of any replacement rim and tyre must not be:

-more than 15mm greater than largest diameter tyre specified by the vehicle manufacturer for that model or vehicle series.

[edit]

so provided that your tyre profile get smaller as your wheels get bigger, you should be able to put 18's on pretty much anything.

http://www.miata.net/garage/tirecalc.html

;)

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The overall diameter of any replacement rim and tyre must not be:

-more than 15mm greater than largest diameter tyre specified by the vehicle manufacturer for that model or vehicle series.

[edit]  

so provided that your tyre profile get smaller as your wheels get bigger, you should be able to put 18's on pretty much anything.

http://www.miata.net/garage/tirecalc.html

;)

i think he is talking about the width of the tyre, not diameter

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Anyway back to the original point...

It is 1 inch wider than the original rim width which is 6½" so 7½"

As I said, you might be able to pull 9" if you base it on the 8" GT-R wheels, but if you wanna bend the rules, the cops will play that game and win.

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Apparently Carmate has rear flared guards for an R32...

But yes... In theory 9" could be legal if what people say about GT-R wheels is correct. I mean it is complianced as an R32 Coupé no matter what version it is (as I understand it) so it could be ok.

If the defect is just for bald tyres then you are fine, just get some decent tyres and rock and roll. Pretty much every 200SX has illegal wheels on it anyway.

If you can pick up a cheap set of 350Z touring wheels they are 17x7 front and 17x7½ rear so that could be a good combo. Just need to find some 350Z with 20" chromies and ask about his stockies!

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