How Can You Figure Out Tire Size?

Car owners may leave certain things for granted. Knowing how to determine tire size, for example, isn't something people spend time thinking about. And then the day comes when a tire is worn or flat. What kind of replacement tire do you need? To answer the question, you do need to ascertain the size.
All the info about size is printed right there on the tire itself. Don't expect to see "Tire Size: 1A."