my stock tire size on my OEM 18" BBS are 235/40/18 on my S4.. i figured it'd be the same for the S-line wheels. i believe 45 is too thick for an 18" wheel.
i plan on running 235/35/19 Dunlop Winter Sport 3D's on my OEM RS 4 19" x 9" et 29 wheels this winter, haha..
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