Dual Tire Info Needed

Optimally, the best matched tires are two brand new tires of the same make, model and size with exactly the same air pressure. It is acceptable to have multiple tread designs and brands across an axle as long as the dual matching tolerance is 1/4 inch in diameter. I would put the two new ones together, and have the tire shop measure the circumference of the remaining old tires and put the best two side by side. Trucking company I retired from always measured their tires before installing them. It was not unusual for them to measure 5 tires before finding a mate to the tire that was already mounted on the rig. Tires that have not been properly matched by size and/or inflation have the same effect on tire life as low inflation or overload.