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Track width is from outside edge of one tire to inside edge of the tire on the other side. It is easier to measure it that way than to try to get center to center of the two front or rear tires. It is important because you need to make sure that there will be enough room to fit the tires inside the fenders. On an metal bodied car you can always roll the wheel opening up a little to make more room, not so easy to do on a glass bodied car.