The Ultra Grip SUV ROF (RunOnFlat) European-inspired Light Truck/SUV Performance Winter/Snow run-flat tire is a member of Goodyear's Wrangler family of light truck tires developed for crossover and sport utility vehicle drivers looking for traction and handling on winter's dry, wet and snow-covered roads. In addition to providing temporary extended mobility in the event a puncture allows complete air pressure loss, the Ultra Grip SUV ROF is designed to combine fair-road winter driving performance with foul-weather winter traction.Goodyear RunOnFlat (ROF) tires incorporate special sidewall reinforcements that support the weight of the vehicle even after sustaining air pressure losses that would render conventional tires immobile. While internal tire damage will likely make replacement necessary, ROF tires are designed to endure being run on while flat for up to 50 miles at speeds up to 50 mph and provide drivers the temporary extended mobility necessary to drive through stormy weather and away from dangerous situations. ROF tires are only recommended for vehicles originally equipped with self-supporting run-flat tires and a tire pressure monitoring system.The Ultra Grip SUV ROF features an advanced silica-based winter compound molded into a V-TRED technology directional tread pattern to combine hydroplaning resistance on wet and slush-covered roads with winter traction in snow and on ice. The Ultra Grip SUV ROF's rounded shoulder and intermediate tread blocks enhance dry and wet road handling while the center rib provides constant road contact for highway stability. The tread design uses strategically placed 3D Bubble Blade sipes that lock together to enhance dry and wet road handling while providing the biting edges needed to grip packed snow and ice without resorting to traditional metal studs. The tire's internal structure uses twin steel belts reinforced by spirally wrapped nylon on top of a polyester casing to enhance durability.The Ultra Grip SUV ROF winter tire meets the industry's severe snow service requirements and is branded with the three-peak mountain snowflake (3PMSF) symbol.Ultra Grip SUV ROF tires feature winter wear indicators to identify when the remaining tread depth remains suitable to provide beneficial snow performance. Install Ultra Grip SUV ROF tires in sets of four only.Due to the nature of all-wheel drivelines and the traction capabilities of the Ultra Grip SUV ROF, Goodyear recommends using Ultra Grip SUV ROF tires only in sets of four to provide the best handling characteristics and tire performance.NOTE: These tires are only identified "Ultra Grip ROF" in the large letters on their sidewalls and are NOT actually branded with the letters "SUV." Goodyear chose this naming convention to help differentiate the new tires (that feature a directional tread design) from their earlier Wrangler Ultra Grip tires (that featured a 5-rib symmetric tread design) that were discontinued in North America in 2005.