Years ago, every car had a a full-sized spare tire stashed in its trunk, ready to fully replace any flat tire. Once the flat tire was removed, and the “spare” was put on, the original tire got a patch and became the spare. As car sizes became smaller, there was less and less room in the trunk for a full-sized spare in the trunk. Obviously, something had to change, and that’s when the temporary spare tire, or “donut” was invented.
Compact Spare Tires, (also known as Donuts)
A compact spare tire fits into the base of your trunk, usually under a hatch or cover, so as not to take up any room in the trunk. The compact spare is already mounted and inflated on a small-diameter wheel. Contrary to what many people believe, it’s not meant to be a permanent replacement for your full-size wheel and tire. (I know, it seems like common sense, right?) The compact spare is meant only to assist you in an emergency so you can reach the nearest service station or dealership to have a new full-sized tire and wheel installed.
Compact Spare Tire – Driving Speed
This should be common sense, since the wheel is smaller – 50 miles per hour is the suggested maximum speed for a compact spare tire. The tire is not designed for driving on the highway – remember, it’s just a temporary solution to get you to a location where the full-sized tire can be repaired or replaced.
Compact Spare Tires – Driving Distance
You should always check with your manual, but in most cases, it is recommended that you not drive any farther than 50 miles on a “donut” spare tire. The compact spare is only meant for emergency situations – leaving it on for too long and driving longer distances will usually result in a flat on the spare tire.
Compact Spare Tire – Air Pressure
Again, check your manual or the side of the tire for exact pressure recommendations for your compact spare. In general, a compact spare tire should be inflated to 60 pounds per square inch (psi) pressure. Check your spare monthly and pump more air into your spare if it is below this pressure.