
A compact spare tire is not the same thing as a full-sized tire. A compact spare tire is smaller than a standard full-size tire. It is also meant to be used temporarily. In fact, you should not drive for more than 40 miles on a compact temporary tire. It is also designed to be used when the car is being driven at a lower speed. It is designed to be used until you can get to the tire store and get a new one.
The reason that compact spare tires are smaller is because full-sized tires may not fit inside of the trunk. Full-sized tires are built to last a lot longer than a compact spare tire. It is much safer for you to drive with a full-sized tire because it will put less stress on your car.