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OP has a 10.5 J rear wheel - OEM is 10J - so 315 on the 10.5J will work. but you should keep the front / rear delta to 30. do increase the front tyre to at least 275/285. other wise stick to 305
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2014 M5
1990 E30 318i Touring
1999 E38 728i -sold
M235i - sold
Activehybrid 5 - sold
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