If replacing two tires, install the new pair on the rear axle to maintain stability in emergency maneuvers, regardless of drivetrain. Make sure the new tires match the existing pair in size, load index, and speed rating, and confirm that remaining tread depth on the other axle is adequate. For the best balance of handling and wear, a full set of four is recommended. Always verify the correct specifications on the door-jamb label and schedule an alignment after installation.