The tyre combination you quoted does match the ISF rim size so no worries here.
I have had my Michelins on for a few months now and the car is without a doubt better handling and quicker around a track than with the previous bridgestone 225/255 set-up.
Absolutely no rubbing, no increase in noise, no change to steering feel. Speedo negligible change, undereads fractionally as it did previously. Grip is far better in the dry, honestly in the wet the Michelins are supposed to be superior to the Bridgestones but I have not felt this, car feels the same in the wet as before.
Am hoping Michelins will wear better than OEM's but remains to be seen.
I highly recommend the 245/275 set-up and I would never go back to the 225/255 OEM size.