Goodyear run flat tyres were called EMT (extended Mobility technology) however because most people didn’t know what EMT meant and they were essentially Run flat tyres, Goodyear decided to change EMT and make it simple by just writing ‘Run On Flat’ on all their run flats. Which makes sense as other manufactures are still writing ‘RFT’ and ‘SSR’ which just confuses people. The acronym ‘RF’ which stands for Reinforced also confuses some motorists thinking it’s a run flat. The Goodyear Run on flat technology is a self-supporting tyre. The concept and design is the same as other manufactures that make the self-supporting run flats. The only difference is the tread design and obviously the performance of the tyre. Goodyear initially started to make the Goodyear NCT5 tread design with the run flat capabilities now Goodyear makes run on flats in a number of sizes and other patterns.
With all run flat makes there is still a long debate on whether a run flat is repairable. BMW recently said that they should not be repaired because of a safely issues, as when run flats are driven on at very low or no pressure the tyre looses a lot of rubber from within the rubber structure.