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My F30 M Sport brakes have 370mm rotors up front and I use 18" wheels for my winter set. F80 comes with 380mm rotors up front came with 513M wheels in 2015 which are 18" so I wouldn't make a conclusion just by looking at the rotor size. It really depends on the caliper design as well as the 18" wheel design. Some 18" wheels may fit while others won't - just have to try them.
Don't rely on what BMW says... on my very first 4 series I ordered, the BMW build system had REMOVED the M Sport brakes from my order because they had selected the 19" all season tires option even though it would have fit no problem. Needless to say, I got them to order me another one with the correct specs.
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2016 Estoril Blue II 340i M Sport | ///MPPSK | 6MT | RWD | Fully Loaded
BM3 Stage 2+ 93 | B58TU HPFP | VRSF v2 Catted Downpipe | 550i Clutch
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