A very common question we get during the Fall and Winter seasons is whether someone needs four winter tires, or if they can get away with two. The simple fact is that installing two winter tires on any vehicle is quite dangerous.
You are probably better off not installing any. If a rear-wheel drive vehicle has two snow tires installed in the rear, you’ll certainly be able to get moving a lot easier. But what happens when you need to steer, or stop? You have tires on the front of the car that may not be up to the task. If a front-wheel drive vehicle has winter tires installed only on the front, it is very easy for the rear of the car to lose traction going around a corner, or under braking, which can lead to oversteering (fishtailing). Winter tires are so much more capable than the snow tires of yesteryear, and grip so much better; it is not a good idea to install only a pair.
This leads into another area, which is four-wheel drive. Of course, four-wheel drive will help any vehicle, regardless of tires, to get moving more easily in inclement weather. You have twice as many tires clawing at the ground than normal. However, once you stop accelerating, and start to coast, or brake, or turn… Four-wheel drive is doing absolutely nothing for you other than being a few hundred more pounds to bring to a halt. This is where having a winter tire on the vehicle becomes a very good idea.