How is it that one tire can fit a gazillion different vehicles? Not all vehicles are made the same, right? Right...but all tires are made the same. Well, sort of. There exists a set of interchangeability standards set by the Tire and Rim Association, Inc. These standards unite tire and wheel manufacturers so that their products are, in fact, interchangeable between vehicles as well as countries. The Tire and Rim Association, Inc. works closely with organizations around the world to assure that tires developed in other countries can be driven on roads in the United States (and vice versa). Standards relate to tire specs like maximum load, tread depth, rim width range and more.
You can read all about these standards in the Tire Rack library of Tire Tech information.