Actually on any car that is using rubber tires the better tires really should be on the front. The front tires do the majority of the braking. The most important job of tires is braking then turning then powering the car foward. Snow chains are put on to either all for wheels or just the drive to get out of a bad situation. They are not made for daily driving or cruising down the freeway at high speeds. Tire chains only on the front of a rear drive car is pretty stupid.