Look, mine are 7" and 37mm offset.
On the front wheels I used 10mm spacers because of the brembo 4 pot calipers. This means that my offset has now gone to 47mm ? ( if thats the right way to calculate it ).
So in any case, the fronts have just about 1 mm of clearance with 1.6 degrees of camber
Thats about as close as it gets !!!
The rear wheels, only have a couple of mm clearance from the rear wheel arches anyway, so without any spacers or anything, I believe the max you can go is another 3mm offset towards the wheel arches.
Any more than that and it will rub ! Tyre make also makes a difference as some tyres have different shaping than others on the sides. I use 205/40/17 tyres.
Pirelli P-Zero Nero's fit perfectly, as well as Michelin Pilot PE2 !
Equivalent Continental's and Yokohama's rub !