Let us imagine a situation where you have just remembered to check your tires after a long time. It does not matter how this happened, but two of your vehicle's tires are too worn to be used anymore.
Here's one for the four-wheeled fleet crowd (or your personal vehicles): if you had to replace only two tires, which would it be, front or rear? Michelin answered that question pretty dramatically ...
Rear-wheel drive (RWD) cars are fun and sporty, the choice cars for drag racing, drifting, burnouts, and all the exciting stuff. Sending all the car's power to the rear wheels might be bad for ...
Best on the front. Steering and traction are important. Some people prefer to have crappier and/or thinner tires on the back in fact so that the handling is more neutral. Depends a lot on the car, but ...