Laboratory-tested and competition-proven in the Grand National Cross Country race series. Knobs extend the tread surface area in order to maximize surface traction. Specially formulated racing compound delivers superior traction while extending tread life. Solid knob design improves traction and reduces tread squirm. Tires are available in both 4-ply and 6-ply for optimum puncture resistance. Two-sided- full-color hot patch on front and rear.