With that wheel your rear offset should be 25, but I don't know if anyone makes a 17 mm spacer. Probably you will have to decide between using 15mm or a 20 mm spacers on the back. Assuming the tires will be 275/30/19, I would prefer the 20mm spacer but the clearance will be tight on the outside between the edge of the tire and the fender lip. There could be rubbing, especially if the car is lowered. With the 15mm spacers you would not have contact between the tire and fender.Someone please let me know if these offset suitable a Z4mr??
Front Wheels: 19x8.5 ET +35
Rear Wheels: 19x9.5 ET +42
Bolt Pattern: 5 x 120
Center bore:72.56 mm
thanks advanced!!