Contrary to yours', I wanted to put RunFlat tires on my Golf (225/45/17) but the workshop said that RunFlat tires may damage the rim in some cases on bad roads since the impact is not absorbed like on the conventional tires. It seems that swapping from factory conventional tire to RunFlat tire can sometimes be problematic
Have you heard anything about this?
Also for dimitris33, a friend of mine switched to conventional tires on his 3 coupe and he's carrying a slim spare tire in trunk. He fastened it with the net( the net that comes with the extra storage package). You might try the same if you're not using the trunk that much.