21 inch GT63s wheels?
The GT63 S has offset of 25,5mm in front and 20mm rear.. (Two different cars for sale in Norway at the moment)
All data from the norwegian vehicle registry.




Front Wheels: 10Jx21 ET30 (p/n A29040108007X71)
Rear Wheels: 11.5Jx21 ET30 (p/n A29040109007X71)
To answer the OP's question, they will not work..
The fronts will work, the rears will stick out. We used 12mm spacers on the E63s for a flush look, making the offset 43mm. 30mm will stick out another 13mm (about 1/2")
Pic with 12mm spacers rear/15mm front.


