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Michelin Pilot Sport 4S – 255/35ZR21 (98Y) The Pilot Sport 4S is Michelin’s Max Performance Summer tyre developed in cooperation with some of the most demanding vehicle manufacturers, including Audi, BMW, Mercedes-Benz and Porsche to utilize key technologies engineered during competition in the 24 Hours of Le Mans. It was designed for serious drivers looking to maximize the performance potential of their sports cars, performance sedans and powerful luxury vehicles. The Pilot Sport 4S excels in warm dry and wet conditions, so like all Max Performance Summer tyres, is not intended to be serviced, stored nor driven in near- and below-freezing temperatures, through snow or on ice. Michelin Pilot Sport 4S Limited Edition Premium Touch LogoSelect sizes of the Pilot Sport 4S are available with Michelin’s Limited Edition Premium Touch sidewall treatment. This velvet-effect checkered sidewall is created using cutting-edge laser technology and is designed to enhance the vehicle’s visual presence. These sizes are identified on the “Specs” page and in the search results. Michelin Pilot Sport 4SThe asymmetric tread pattern of the Pilot Sport 4S features side-by-side, 24 Hours of Le Mans-derived compounds. The low-void outer shoulder utilizes a new dry-focused hybrid tread rubber for improved dry handling and braking over the previous generation tyre, while the center ribs and inboard shoulder feature a silica-infused wet compound designed to increase wet braking performance. The computer-modeled Variable Contact Patch 3.0 optimizes pressure distribution across the contact patch through turns, reducing hot spots and improving tyre life during aggressive use. Internal construction of the Pilot Sport 4S features twin steel belts reinforced by a spirally wound hybrid reinforcement. This hybrid Aramid and nylon belt offers a lightweight, high-strength reinforcement above the steel belts to enhance high-speed handling, wear and durability. Specifically tuning the application of the cord filament provides Michelin engineers the ability to balance tension and strength, and a single-ply, polyester cord casing balances trade-offs between ride quality and responsive handling. Limited sizes of the Michelin Pilot Sport 4S are available with Michelin Acoustic Technology, which involves the manufacturer adhering a layer of sound-absorbing foam to the inner liner of the tyre to reduce cabin noise in the vehicle. These sizes are identified on the Specs page and in the search results. Note: tyres 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 Max Performance Summer tyres during cold-weather use can result in irreversible compound cracking. Compound cracking is not a warrantable condition because it occurs as the result of improper use or storage, tyres exhibiting compound cracking must be replaced.