Why has BMW stopped using run flat tyres?
run flat tyres are more likely to cause cracked alloy wheels as bumps and potholes are unable to be absorbed by the hardened sidewall. This transfers massive trauma onto the alloy wheel itself which can cause extensive damage to your bmws alloy wheels. Run-flats can also be more susceptible to potholes and rough roads. Additionally, due to the more rigid sidewalls, run-flats make for a rougher ride (although this, perhaps, does not apply to rolls royce run-flats!