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Something else: Pirelli SottoZero II oem star-spec (BMW) runflats are high speed tires. Excellent directional stability on any surface. Michelin PA4 do provide better traction, they are wider, but they become quite floaty the faster you go. Even highway speeds. Not that I think you'll be going that fast in Colorado but... at 140-160 km/hr they become really floaty. At the same time, with SottoZero II runflats I had no problem going 240 km/hr time and again, slowing down, braking, maneuvering on a highway in winter conditions. SottoZero 3, too, have excellent directional stability, and the sharpest steering of the three, including on ice, traction comparable to series II. My gripe with SottoZero 3 was I kept getting sidewall bubbles all the time and had to discard a number of tires during one season. I never had that problem with SottoZero II or Michelin PA4.
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