Run Flat is a tyre that is designed to allow you to continue driving safely after a puncture and loss of pressure. There are a number of different Run on Flat technologies available on the market, but all of them require a functioning tyre pressure monitoring system (TPMS) and strict rules - after a puncture, driving no faster than 50 mph and for a maximum distance of 50 miles. Run Flat tyres can only be mounted on cars that are factory-fitted with this type of tyre.