Abstract: A method and apparatus for controlling the amount of extruded material being formed from rubber stock into a continuous ribbon for deposition upon a tire body during the retreading operation. The mass flow rate of the extruded product is controlled by a sensing apparatus which is connected to a motor governing the advance of such rubber stock through a pair of specially shaped rollers at the discharge end of the extruding apparatus. The ability to control the through-put of material provides the tire surface with layers of material exhibiting favorable characteristics.