The Potenza S001 RFT (Run-Flat Tire) is Bridgestone's Max Performance Summer self-supporting run-flat tire developed as Original Equipment exclusively for BMW 3 Series sedans beginning with 2012 model year F30 chassis vehicles. Designed to provide temporary extended mobility for a distance of 50 miles at up to 50 mph even after a puncture has allowed complete air pressure loss, the Potenza S001 RFT also delivers sports performance in dry and wet conditions. However, like all summer tires, they are not intended to be driven in near freezing temperatures, through snow or on ice.Potenza S001 RFT tires feature an asymmetric design combining a large outboard shoulder, interlocking tread blocks and a central circumferential rib to enhance dry road steering response, high-speed stability and cornering precision. Notches in the shoulders expel water to the sides while high-angle lateral grooves in the intermediate ribs pump water into the wide circumferential grooves to help resist hydroplaning.The tire's internal structure features a lightweight belt package consisting of twin steel belts supported by a spirally wrapped aramid/nylon cord reinforcement that reduces rolling resistance, enhances ride quality and ensures high-speed durability. The internal structure of the Potenza S001 RFT also features Bridgestone Side Support Run-Flat technology reinforced sidewalls to temporarily support the vehicle after a puncture causes a loss of air pressure. Install Bridgestone Potenza S001 RFT tires in sets of four only.Due to the traction and handling capabilities of the Potenza S001 RFT, Bridgestone recommends they be used in sets of four to provide the best handling characteristics and tire performance. Potenza S001 RFT tires may NOT be mixed with other tire models, such as the Potenza RE050 RFT, Potenza RE050A RFT, Potenza RE050A I RFT or Potenza RE050A II RFT.Though they cannot be labeled as run-flat tires, tires branded with MOExtended or MOE on their sidewalls offer run-flat-like characteristics by delivering limited temporary extended mobility after a puncture results in complete loss of air pressure. Because MOExtended or MOE tires do not have the same speed and distance endurance of conventional run-flat tires, they should not be substituted in any situation where a conventional run-flat tire is required. To confirm what your vehicle needs, check our Original Equipment tire listing for your year, make and model or see your vehicle owner's manual. Related Information: Learn more about MOExtended/MOE tires here.