Winter tyres from OPC

[Matt]

I was about to say the same, Porsche are very specific on the tyres, let alone the snow chains etc. Tyres for example I believe have to be N rated, else you can have warranty issues - assuming I have read this correctly. On the snow chains, I believe its only 18 and 19" that are accepted as allowing chains. When I did a quick check for snow socks, I didn't find any for 20 or 21