The N FERA SUR4G is Nexen's competition-proven Extreme Performance Summer tire developed for serious sports car, sports coupe and performance sedan driving enthusiasts looking for race tire-like traction on the street or for use in drifting, autocross and track events. Tuned for maximum performance in warm dry and damp conditions, the N FERA SUR4G is not intended to be serviced, stored nor driven in near- and below-freezing temperatures, through snow or on ice.Compared to its predecessor, the N FERA SUR4G utilizes a new, higher-grip compound designed to come up to temperature faster and deliver greater levels of dry and wet traction. This special compound is molded into a directional tread design with a continuous center rib flanked by massive shoulders featuring less void area to create a larger shoulder block and improve lateral grip and durability. The tread forms a highly rigid footprint that delivers near-motorsports levels of dry grip and handling. The computer simulation-designed tread profile evenly distributes pressure and contact with the road, maximizing available traction for acceleration, braking, cornering and improving tread life. Two wide, circumferential center grooves provide a direct path to channel water through the contact patch, while diagonal independent grooves help direct water to the sides of the footprint to enhance wet traction.The 275/40R18 size N FERA SUR4G utilizes a unique compound optimized for use in drift competition. This compound is designed to work in a higher temperature range and tolerate heat more effectively than the standard compound used in all other sizes.The N FERA SUR4G features a two-ply polyester casing to help resist lateral deflection and provide responsive handling and cornering stability. Two wide steel belts with a seamless, high-strength nylon cap ply (two-ply in 255 and wider section widths in 18- or 19-inch rim diameters) promote uniform ride quality and high-speed capability.Note: Extreme Performance Summer tires exposed to temperatures of 20 degrees F (-7 degrees C) or lower must be permitted to gradually return to temperatures of at least 40 degrees F (5 degrees C) for at least 24 hours before they are flexed in any manner, such as by adjusting inflation pressures, mounting them on wheels, or using them to support, roll or drive a vehicle.Flexing of the specialized rubber compounds used in Extreme Performance Summer tires during cold-weather use can result in irreversible compound cracking. While compound cracking is not a warrantable condition because it occurs as the result of improper use or storage, tires exhibiting compound cracking must be replaced.