i have a UK brochure infront of me and it says they are optional z4 wheels and they only come in 18". they are called M-Cross spoke comp. style 101 part number given is 36 11 0 145 816 and the fronts should be 8 x 18" 225/40/zr18 and rear 8.5 x 18" 255/35 zr18. hope that helps. If i'm not mistaken they look similar to the E65 wheels wich i believe come in 19's.
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