High Quality Content by WIKIPEDIA articles! The Michelin PAX is an automobile run-flat tire system that utilizes a special type of rim and tire to allow temporary use of a wheel if its tire is punctured. The core of Michelin`s PAX system is the semi-rigid ring installed onto the rim using special equipment. It provides support to the tire and its sidewall to allow emergency operation at limited speed until such time the tire can be replaced. Cars that use the system are as exotic as the Bugatti Veyron EB 16.4 super car to the Rolls Royce Phantom to more pedestrian minivans such as the Honda Odyssey and Nissan Quests.