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Originally Posted by JST
There are run flat tires that do require special rims in order to retain the rim bead. The advantage of this system (e.g., Michelin PAX) is that you don't have to have the super stiff (and heavy) sidewall that other run flats use. On the other hand, you have to have a special wheel.
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AFAIK, the new RR uses those PAXs, don't think any other cars do. BMW has been using run-flats for some time now on the Z8, no special rims required.
Some people are just "special", Hack
