Even after a complete loss of tyre pressure, run-flat tyres retain their shape and remain firmly attached to the rim. Even at higher speeds, the BMW 1 Series Convertible (125i, 135i and 123d) remains stable and precisely controllable. The car can be driven for up to 150 km at 80 km/h following loss of tyre pressure - or even longer in the case of a slow puncture. The need for a spare tyre is eliminated.
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