Tire with run-flat warning device

Claim 1

IN THE COMBINATION OF AN OUTER TIRE MOUNTED ON A RIM AND AN ANNULAR SAFETY WALL DIVIDING THE SPACE BETWEEN SAID RIM AND TIRE INTO RADIALLY DISPOSED INNER AND OUTER CHAMBERS WITH MEANS FOR INFLATING SAID CHAMBERS, THAT IMPROVEMENT IN THE SAFETY WALL WHICH COMPRISES MAKING SAID SAFETY WALL OF SUBSTANTIALLY UNIFORM CROSSSECTION AND RADIAL EXTENT AT ITS OUTER CIRCUMFERENCE AND PROVIDING A RUBBER TREAD ON SAID OUTER CIRCUMFERENCE HAVING A MAJOR CIRCUMFERENTIAL PORTION APPRECIABLY LESS THAN 360* OF THE CIRCUMFERENCE OF SAID WALL AND A CIRCUMFERENTIALLY ADJACENT MINOR PORTION OF LESSER RADIAL THICKNESS THAN SAID MAJOR PORTION THUS FORMING AN AREA AT THE OUTER CIRCUMFERENCE OF SAID TREAD OF LESS RADIAL EXTENT THAN SAID ADJACENT MAJOR PORTION, THE RUBBER IN SAID TREAD BEING SUBSTANTIALLY UNIFORMLY DISTRIBUTED THROUGHOUT THE MAJOR AND MINOR PORTIONS TO PROVIDE FOR SUBSTANTIALLY EQUAL DISTRIBUTION OF THE WEIGHT OF THE RUBBER, THE MAJOR PORTION HAVING THE RUBBER THEREIN EXPANDED TO A GREATER THICKNESS THAN THE MINOR PORTION BY THE PROVISION OF NUMEROUS VOIDS THEREIN.