Do you know what kind of tires your car has? From the factory most models come with either all-seasons or dedicated summer tires. These days most BMWs are sold in the US with all-seasons. But if you have an M car or even M Performance you have summer tires designed for use in temps above 40 degrees. And if you have summers and live where the snow flies often, you need to read on. And come to think of it, if you have all-seasons and also live in the snow belt, read on. You know where this is leading to so lets get right to it. What are winter tires and why do you need them? Surprisingly, the answer isn’t only snow. If you’ve been following BimmerFile and MotoringFile for any time, you’ll know we are big proponents of winter tires for climates that see cold temperatures and snow fall. But one aspect that gets missed about winter tires is that they’re not just designed for snow. Modern winter tires are created with compounds that adhere to the road no matter how cold temperatures get. Compare that to summer tires which not only have no grip in snow but little to no grip on dry cold pavement as well.