I don't know what you mean by metal plates, there are no metal plates inside a tyre. Car tyres will generally have a steel hoop (bead) to fix the rubber to the rim. They also have a flat 'belt' beneath the running surface, which is made from a woven steel or fabric mesh. This gives the tyre its shape, holds the sidewalls together, and widens the area over which the road load is spread.
Don't be bitter about getting no help from "the forum people", you gave it less than 30 minutes before you gave up. I just checked on Google and had the answers I've given you in less than 30 seconds.