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The DriveGuard is Bridgestone’s Grand Touring All-Season self-supporting replacement run-flat tire designed for safety-minded drivers whose cars* were not originally available with run-flat tires as well as drivers looking for a longer wearing better riding option to replace their vehicle’s Original Equipment run-flat tires. Featuring Bridgestone’s latest run-flat technology DriveGuard tires are designed to offer almost the same riding comfort as conventional tires while providing temporary extended mobility for a distance of 50 miles at up to 50 mph even after a puncture has allowed complete air pressure loss. DriveGuard tires can help drivers better manage their busy schedules by avoiding becoming stranded in a rural area on a crowded expressway or in inclement weather because of a flat tire. DriveGuard tires are also designed to provide year-round driving flexibility by offering predictable handling traction and control on dry and wet roads as well as in light snow. DriveGuard tires mold a silica-enhanced all-season tread compound into an asymmetric tread design that blends predictable handling and cornering stability with long wear and all-season traction. Circumferential and cross grooves help evacuate water to resist hydroplaning while engineered sipes increase the number of biting edges to enhance wet road and wintertime traction. The tire’s internal structure includes twin steel belts reinforced by spirally wrapped nylon on top of a rayon cord casing that features reinforced sidewalls to temporarily support the vehicle after a puncture causes a loss of air pressure. Bridgestone’s NanoPro-Tech Sidewall reinforced rubber compound is molded into sidewalls that feature a sophisticated Cooling Fin Design to blend run-flat performance with a lighter-weight construction that doesn’t sacrifice as much ride comfort. *Cars must be equipped with a Tire Pressure Monitoring System TPMS.