In order to minimize the the inconvenience of the inevitable flat tire, Dunlop has been developing run-flat tire technology since the early 1970s. Dunlop's early DENOVO run-flat tires were followed by their Denloc ultra high performance run-flat tires which were used as original equipment on the Porsche 959 supercar with its 200 mph top speed. Additionally, Dunlop racing tires incorporating the Denloc design were used by IMSA GTP and FIA Group C Class racing cars for North American and international endurance racing events such as the 24 Hours of Daytona and 24 Hours of LeMans. The disadvantage of these earlier systems was that they required the use of unique wheels which greatly increased the cost of installing a run-flat system.
Check your old tires for dry rot.