Editorial Comment:

The simple answer is: "You can't."

It has been years since the tire industry stopped counting plies in tires. The ply used to refer to the number of cotton cords which were used in the construction of tires.

Now synthetic cords are used along with steel bands and these are usually only one layer thick, which the difference in strength being expressed in a term which is "ply rating". The term tells you what the equivalent strength is IF they were cotton cords ... but unless you find some old or unusual tire with cotton cords you will never find this number of actual plies in the tire.

So, if you look for the words "Ply rating" which is only used on some tires, you can get this measurement.

TG