Yeah, I noticed the same thing about the offset...
Rears are 9.5J with supposedly ET45 (looks more like 35 to me), shod in 245 section rubber.
Fronts are 8.5J, ET40 with 225.
No rubbing in the front, but I've caught the right rear on a really bad highway dip.
The wheels need to be refurbed sometime as well - the stupid couriers scratched them after they'd juuuust been refurbed. I'll drive it a bit longer and see exactly how badly they rub - will then roll the arches and check again...
If they still rub, I'll just have a few mm milled off the mounting face of the wheel when they go for refurbishing - problem solved.