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#9: 01-21-2013, 05:52 PM
 
 awalegacy
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If you bought the right size tires with your new 17" wheels, the diameter of the tire should not have changed at all. Even if you went to 18" wheels, with the proper tire size, the overall diameter should remain the same.

All of this means that you should not need to change your spare.

On another note, I'm pretty sure the donut that comes with these cars IS undersized.