Different front/rear pattern design - Immediate handling response provided by a wide shoulder and center block design. An optimized grooved pattern and block stiffness result in maximized grip.(Y) speed rating - Stable durability and driving performance over 186 mphHigh functioning compound and enhanced stiffness optimizes tire grip and maximizes high speed durabilityThree-dimensional block (C-Cut 3D) design and an advanced belt package are applied to provide high speed stability and brakingCompared to other UHP tires, the ECSTA PS91 has improved the bead allowing more strength and an improved rim protectorHeat releasing dimple technology (heat dissipating block pattern) maximizes thermo-diffusion and high-speed durabilityTo decrease vibration and increase ride quality, the Ecsta PS91 has an improved sidewall and tread structureThree dimensional block and maximum grip controlDesigned for high end performance vehicles, the cosmetic racing-flag tread indentations portray an exotic super car imageNoise reduction - Improved tread block placement helps reduce road noise