Carry on regardless.

Run-flat tires.

Say goodbye to roadside tire changes. Thanks to special side-wall reinforcement, the BMW Z4 Roadster's standard run-flat tires are capable of being driven a further 250 km even after a puncture. The benefits make themselves felt far beyond that. The need for a spare tire is eliminated, reducing weight and freeing trunk space on every single journey. In addition, the standard Tire Pressure Indicator (TPI) warns the driver whenever there is a fall in tire pressure.