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However, it’s often deemed the less efficient run flat option because it allows air to leave before the sealing layer becomes active. The technology reduces the amount of air lost compared to a standard tyre with a puncture. Self-healing tyres - created by Continental, automatically seal any puncture.There are two main types of run flat tyres – self-healing and self-supporting. To help BMW owners decide whether to keep theirs, we’ve highlighted the pros and cons. The brand’s collaboration with Bridgestone provided customers with improved fuel economy and a safer method of punctured tyre replacement. In 2009, BMW decided to fit all of its models with run flat tyres as standard.