The image above is of the Goodyear Wrangler tire which blew out on the rear axel of my van.  

Every car has a tire constructed just like this.  Fabric (polyester, etc) cord running across the tire, and steel cord alligned around  the circumference of the tire. 

Synthetic rubber everwhere in between.

When it blows up - this is what it looks like.

De-lamination.

If the fabric and steel fibers aren't protected by rubber, the tire is done.