It features a reinforced internal structure, which keeps its ideal tire shape under load and driving pressure, even after air pressure loss. This model ensures a 50-mile, 50 mph performance once air pressure loss occurs. Run flat tires prevent the vehicle from being stranded on the side of the road, allowing the model to be driven for a short while. These tires should not be mixed on the same vehicle as regular tires, as their structure makes them heavier.