The problem is that the calliper extends effectivly from the centre of the disc out to as far as it extends, to make the ssetup any smaller, the inside edge of the calleper would need to be trimmed to the same extent as the disc.
This can be done with the honda's, trimming the pads allows one to move the calleper closer to the centre, therefor fitting under a 10 inch mag.
so yes you are correct, it is the callepr that limits the wheel size, as it sticks out furtherist.
do i make any sense? its early, its raining, and im supposed to be moving house
), but they're not that bad any more. I looked through the DBA replacement rotor database, and I couldn't find anything in there that wouldn't require machining. So the easiest solution is to run the S rotor, and, if you're running the S rotor, you may as well get the rest of the setup... You can get it for around $1480 ex UK (including freight). 
Plus the rear slave cylinders, etc. Still a bit better than the local costs. If you get import it all in one hit, you'll have to pay Import Duty and GST, just like the local sellers (which is why their prices are higher, plus a little bit of profit, though they're pretty fair, there doesn't appear to be much in it for them). So the trick (not that I've done it yet) is to get it sent broken into a couple of packs, with a time difference between the two packs. I've asked an online seller over there about doing that, and they're willing to split up the pack.