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The "run-flat" system ______ .
The fact that many women are unable to change a wheel is not the only reason for regarding the spare wheel as a tiresome anachronism. For most of its life, a spare wheel represents dead weight, a waste of fuel and valuable space. What everyone would welcome is a way to do without an onboard spare altogether. A "run-flat" system would allow you to drive (at reduced speed) to the nearest garage. It would also keep the tyre on the wheel in the event of a blow-out, helping you maintain control. Run-flat Systems have been developed by all the major tyre manufacturers, but none has made it to large-scale production. SP Tyres, better known as Dunlop, launched its system in 1973, but it flopped because it was too complex and costly, and because of compatibility problems. A new run-flat system is being demonstrated to car manufacturers now. If it meets their requirements, the days of the spare wheel could be numbered.