The Direzza ZII Star Spec is Dunlop's Extreme Performance Summer tire developed for serious sports car, sports coupe and performance sedan enthusiasts looking for race tire-like traction on the street or for use in autocross, drifting and track events.As an evolution of the Direzza ZII and continuing to use the same tread design, the Direzza ZII Star Spec's tread compound helps provide faster lap times from the start by developing more traction in temperate temperatures along with consistent grip on subsequent laps when the tires are fully warmed up. While this means the Direzza ZII Star Spec's tread compound accommodates a wider operating temperature range, it is not intended to be serviced, stored nor driven in near- and below-freezing temperatures, through snow or on ice.Dunlop's warranty states: "Ultra high-performance summer tires are not recommended for winter use, and tread or shoulder cracking on those tires resulting from winter use will not be covered under our warranty."Direzza ZII Star Spec tires confirm their "Star Spec" identity in the form of a 5-pointed star symbol branded adjacent to the "Direzza ZII" name on the sidewall. However, this 5-pointed star should not be confused with the same symbol often branded by tire manufacturers on the sidewalls of Original Equipment tires for BMW vehicles.Direzza ZII Star Spec's high-grip tread compound is molded into a directional design with a continuous center rib flanked by massive shoulders that form a highly rigid tread that delivers high levels of dry grip and handling while promoting uniform tire temperatures and even wear across the tread. Two wide circumferential center grooves channel water through the center of the tread design while angled independent grooves help direct water to the sides of the footprint to enhance wet traction.The Direzza ZII Star Spec features Dunlop's True Circle Profile that distributes tire deflection forces along the sidewall to provide more control by better communicating tire performance limits to the driver. Its internal structure includes JointLess Band (JLB) Technology that spirally winds polyamide cord over the two wide steel belts to promote strength, uniform ride quality and high-speed capability while 2-ply polyester sidewalls help resist lateral deflection to provide responsive handling and cornering stability.Note: We recommend installing Direzza ZII Star Spec tires in sets of four to fully realize their benefits.