Browsing through, created an account when I saw this thread. Most recently worked as light duty and lube tech for a Dodge dealership but started a tire man at Americas Tire. The tire industry has moved to keeping new/better tread tires on the rear as the last replier said, due to the testing I wet roads during turns. Also, regardless of if a vehicle is FWD, RWD or AWD, once it starts moving forward, your traction is now in the rear. Hence why FWD cars spin their tires so easily, muscle cars squat on launch, and many top end cars are mid engine rear wheel drive. Moves the center of gravity over where the traction will be.