A flat tire is never convenient, but some cars make the situation a little less dramatic by carrying a tiny spare tire instead of another full-size wheel. It might look almost comically small compared with the tires on the car, but that little donut has a very specific job.
A space-saver spare is not designed to replace your normal tire. It's an emergency solution meant to get you off the side of the road and to a place where the damaged tire can be repaired or replaced. And because it's different from a normal tire, there are some important rules you need to know before driving on it.
