By the looks of this newest X4M track testing video, it looks like BMW will be putting on a wider rear rubber
There going to have to widen the wheel arches.
Whatever wheel sizes the 2018 Mercedes AMG GLC63 S Coupé is running looks about appropriate for the X3M/X4M!
And I totally dig the AMG's seven spoke satin Black rims!!!
2018 Mercedes-AMG GLC 63 S Coupé
TIRES
Brand: Michelin
Model: PILOT SPORT 4S
Front Size: 265/40 ZR 21
Rear Size: 295/35 ZR 21