The Dunlop SP Sport 01 A/S DSST ROF tire is a run-flat high performance tire with special tire compounds and construction that gives the tire a smooth ride and extended mobility. The high performance tire has Dunlop's newest technology is the Jointless Aramid tire wrap which helps the tire maintain it's shape for a smooth ride at all speeds. Aramid (also called Kevlar) is also used in the bead area which ensures a tight and secure fit of the tire on the rim. The rim is also protected from accidental curb damage with Dunlop Tire's Max Flange Shield® technology. It features a silica tread that improves dry and wet traction while helping to minimize rolling resistance. Its Dunlop® Self-Supporting Technology (DSST)® * means a patented sidewall design that allows driving on flat or deflated tires up to 50 miles at 55mph. A great added benefit of this well priced run-flat tire.