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Well I bought the 2018 640IX GT M sport with 19"-8.5" wheels and 245/45-19 run flats . Regarding the snow tires, the size needed is 245/50-18 square. the wheels need to be new 5/112 bolt circle, 30 mm offset found on the 2017 G11, G12 and G30 G34 . It means the extra wheel sets from my 2014 328 IX GT do not fit and I am selling them. I am getting some 2018 740I base take off wheels which are 18" x 8. I am probably going to put on Michelin X3 Snow tires on them but I am still looking. I will try to post photos.
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