Run-flat tires are expensive; a replacement P-Zero costs over $420 with labor and taxes. In my case, the repair cost was not covered by BMW, and while Pirelli has its own warranty, it's conditional.

Run-flat tires safe, but not safe from lawsuits / Complaints about price, wear, lack of repair facilities. By Christopher Jensen, New York Times March 24, 2007.

A run-flat tire is specifically engineered to withstand a puncture so that a car can still be driven, even if air pressure is reduced to zero. Its reinforced sidewall ensures that a vehicle can ...

Run-flat tires allow vehicles to continue operations even with complete pressure loss in several tires. Getting run-flat equipped systems back in the hands of warfighters in a timely manner ...