I upgraded the wheels/tires on my wife's 2011 128i M-Sport convertible from 17" to 18" - specifically 18x8 with 225-40 in front and 18x9 with 255-35 in the rear. Really helps the handling and ride, and the 18" tires are non-runflat (we keep an M-Mobility kit in the trunk).
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2015 F80 ///M3 Sedan 7DCT Tanzanite, 2022 X3 sDrive30i 8AT Brooklyn Grey
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