Tread Layer. Tread area for superior road grip and maximum water displacement. Zero-degree ply for advanced high-speed capability. Steel belt package optimized for stability and handling. Interior. Cord body insert for shape retention even at high levels of interior pressure. Side strip to help guard against lateral tire and wheel damage. Butyl liner to help prevent pressure loss during normal operation. Steel bead to help ensure firm grip on the wheel. Bead reinforcement to help maximize driving stability and steering response.