Look at the back side of the wheel. The wheel specs should be stamp on the back. You'll see "18x8" somewhere. Then you should see either "ET" or "+" (or something like that) followed by 2 numbers (eg ET 30), which tells you (+30 mm) offset.
Like Semtex said you could still use the tires so long as overall diameter is around OEM spec (25.6", IIRC).
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2012 GT-R Black Edition Jet Black
2010 370Z 40th Anniversary // SOLD
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