BlackMogul
Also winter tyres may ... alter the handling on normal road conditions
Yes, but the same goes for buying Linglong, Triangle or Sunny summer tyres instead of Bridgestone, Continental or Pirelli summers; unfortunately we can't stop people fitting their cars with shit cheap tyres.
Not sure what "out perform" above means.
Really I was referring to most important things any tyre helps you to do: stop and turn; the ability to stop crashing into someone/something, or being able steer around the person/thing you're sliding towards.
A 4x4 will not stop any quicker on summer tyres compared to a 2WD car on winters from a given speed (especially if the 4x4 waighs over a ton more than the 2WD car). An AM on winters would stop quicker because it weighs less and has more grip.
If you can't turn your car then you have next to no control. Any car can understeer into a tree if you have no grip on the front wheels.
It really doesn't matter how quick an RR can be, in snow (or other treacherous wintery conditions) you may not be able to go more than 20mph safely.
There are plenty of YT vids of powerful winter tyre-shod RWD cars out-accelerating, -turning and -stopping well-respected 4WD cars (Subaru Forester being one example that springs to mind) on normal/summer tyres.