Good Info! Tire stagger was discovered by the boys in NASCAR. The car will steer differently in each direction depending on the side the larger tire is mounted on. If you set the car up with equal size tires and tweak it flat, then put a larger tire on one side you will pick up a bit of understeer in corners where the big tire is on the outside at the expense of a bit of oversteer the other way. This was a useful tuning tool for oval racers, but not widely used by road racers. With radial tires the size differences were almost eliminated so you don't hear NASCAR teams say they are adjusting the stagger much today. It can be a useful tool, but primarily in oval.