1. A method of measuring tire wear on a tread surface, comprising the steps of: applying a single layer of reflective paint to said tread surface of said tire, measuring an intensity of light reflected from said single layer of reflective paint while said single layer is on said tread surface of said tire to obtain a first light intensity value, then running said tire for a short distance to partially wear said single layer of reflective paint, then remeasuring said intensity of light reflected from said single layer of reflective paint while said single layer is on said tread surface of said tire to obtain a second light intensity value, and comparing said first light intensity value with said second light intensity value.