I bought a second set of wheels and mounted snow tires on them before realizing what I bought wouldn't fit on my Boxster S. I used the recommended tire and wheel combination for the Boxster and the larger brakes on the S rub. So, now I have tires that have never seen the road, and never will with my Boxster S.
If you have a standard Boxster and want to be able to drive safely in the snow . . . and live in the Denver area (I'm in Boulder) - let me know. Great deal on these tires and wheels.