C30 with 18 inch winter tires rideable?!

Hello guys, will be in about a month proud owner of a 2009 Volvo C30 T5 R-Design, with 18″ Atreus (215/45) Pirelli summer tyres. Since we now have winter tyres compulsory in Austria from 01.11 to 15.04 (pronounce half a year!), I thought to myself to the original 18″ Atreus, winter tyres with the same dimensions. Now I was yesterday at a tyre dealer and he absolutely wanted to sell me 17″ aluminiums with the corresponding tires, because 18″ with a width of 215 are The winter tires must be always thinner than the summer tires… erm, that means wider summer tires for me and the thing is eaten?! No seriously, I would be interested in what you say about them. Since I live in Vienna the “hazard” of a snow runway is quite low, however, some snowboard trips are planned into the Alps and then the winter tire should already have enough grip… aja, here the tires to choose from: Bridgestone: Blizzak LM-22 XL 215/45 R18 93V Yokohama: W.Drive 215/45 R18 89V Pirelli: W240 Sottozero XL 215/45 R18 93V mfg mario