I thought that was standard, that they wouldn't cover the 'modification' wheels but running them wouldn't invalidate your policy. I'm sure thats the terms Admiral apply to my insurance with winter wheels/tyres.
I'm not sure about your argument about 'having' to switch to 18"s... You could fit winter tyres to any 19" wheel if you wanted. I run 18" winters but really only because the winter tyres are a lot cheaper in that size and I don't care how it looks in the winter when its all dirty most of the time anyway......
2012 Alpine White E92 335d M Sport LCI | Coral Red Dakota Leather | Media Package - BMW Professional | 313 Wheels | Evolved |
Previously - 2009 Alpine White 325d M Sport LCI | Auto + Paddles | Media Package - BMW Professional | BMW Performance Front, Sideskirts and 313P Wheels | Black Grilles |
Carbon Black E46 ///M3 '04 | Manual | Evolved |