Let's not forget that GTS tire sizes are made to fit on the GTS/ZCP wheels. You will have no issue fitting 255/35/19 front and 285/30/19 rear on ZCP wheels with no spacers. If you start to add spacers and/or play with offsets to get a more aggressive look, you may run into rubbing problems.
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Audi S6 * Audi S3 * Porsche Cayman GTS
--Former BMW M3 owner
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