It depends on what wheels you have - if they're the same width all round, you will use 245/45-18; if you have wider rear wheels than the front, you will use 245/45-18 front, and 275/40-18 rear. The M Sport saloon usually has the wider rears!
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Audi A4 Quattro 2.0TDI 177 2012/12
VW Golf GTE Advance 2017/67
Porsche Boxster 986 2.7 2000/X
Suzuki GSXR 750 2004/04
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