Originally Posted by
bobesser
Bob's winter tire primer: There are basically three things that will affect performance in winter: Tread compound, tread void, and sipes.
Tread compound: Tire manufacturers engineer this to be flexible (but not too flexible) within a certain temperature range. Unfortunately, if it is flexible from 50F to 100F, it will be very inflexible (glassy almost) at low temperatures. Similarly, a tire engineered for flexibility from -20 to 50 will be too flexible at higher temperatures (greasy).
Tread void: Essentially, how much can it grab the snow. Think of the difference between a performance summer tire and a big knobby jeep tire.
Sipes: Sipes are the little zigzaggy lines cut into the treadblock on the tires. Summer tires don't have any, winter tires have lots. Sipes help grab smooth, slick surfaces like ice or packed snow.
When choosing a winter wheel/tire set, lean towards tall, narrow tires - this allows the tire to really dig into the snow. If possible, get one or two sizes smaller diameter wheel - as long as it fits over the brakes.
I have driven on three winter tires:
Hankook Icebears: Great snow tire and inexpensive. (Lots of tread void and sipes) I was unstoppable in snow in Syracuse, NY! My car at the time was a Dodge SRT-4 with 17" stock wheels. I bought these on 15" rims. On the highway with no snow, they felt a little squirmy and made some noise, but, never dangerous. (but, I wouldn't hotrod them).
Micheline Alpine 3: These are really a performance tire with a low temperature compound and some sipes. (not much tread void but lots of sipes) They were fine on cleared roads, but, I had trouble getting from cleared roads to the driveway. Car was a 1996 Porsche 911 with stock 17" tire fitment.
Bridgestone Blizzack: Currently running these on my 2006 M3. I have not driven them in the snow yet, but, they appear to be more on the Hankook Icebear side vs. the Alpine side of the scale. (lots of tread void and sipes) I have them in the stock 18" fitment. They are not too noisy on the road but they also do not handle like a sport tire. On the drive in today at 19F, I did not notice any issues with the tire getting hard or reduced traction (you would definitely notice this on a summer tire).
Bob
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