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Hi Tire size is correct, this happened once with the run flats also coming off the #407 onto #410 onramp at about 210 k. they have never lost all the air but have dropped as low as 21 psi in a very short time when ther had been no warning light . than for the response Paul

After 22,000 km the runflats needed replacing, I had the Pilots installed, it has been only a week but on 2 occasions when accelerating from around 160 to 190 the tire sensor has gone off and tire pressure has been found to be way down, this is in 2 different wheels, any ideas?