so u are right.
Rears: 18x9 255/35ZR18 90W
Fronts: 18x8 225/40ZR18 92W
Offset: +48
the offset is a little high, however with the purchase of the rims brand new 32mm spacers will be included. makes it pretty flush, once my car is out of the shop ill have pictures of them mounted on my car with spacers.
The pictures above = without spacers.