Quote:
Originally Posted by HIRISC
The question really shouldn't be about tire diameter, it's tire width. The thinner the tire, the better in the snow - all other things being equal.
That said, I've run 20" Pirelli Scorpion Ice/Snow on my X5M for three winters - they worked great.
I'll be doing the same thing with my new X5.
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I have the 20" Pirelli Scorpion Ice/Snow for winter too (on another set of wheels). We had such a mild winter last year that I never got to really try to them out so I can't speak to how they compare to the 18" winter tires that I had for a few winters before that...
My dealership switches my wheels for about $60 --- which I think is a bargain. Free would be better but I'm not complaining.