Many run flat tires can go up to 50 miles at speeds up to 50 mph while flat. Typically, run flat tires use one of two supporting systems. One is a self-supporting system, while the other is the support ring system. So yes, overall run-flat tires may be a bit safer. How long run-flat tires last? It is generally accepted that the tread of run-flat tires lasts as long as their normal counterparts. In other words, a summer run-flat tire will last as long as a normal summer tire, and the same can be said for all-season tires and winter tires. Tread grooves move water through and away from the tire to help reduce the risk of hydroplaning. The block itself grips the road, enhancing traction in wet and moderately snowy conditions . And, when the tire goes flat, you can run flat, up to fifty miles’ distance and up to 50 MPH,