While I was on All-Data this afternoon I noticed this Shop Bulletin covering tire storage. Since I was ready to put my D away for a while I found it interesting, especially since I have some fairly new Michelins. Harold McElraft - 3354 Mercedes-Benz USA, LLC ALL MODELS STORAGE OF VEHICLES EQUIPPED WITH HIGH PERFORMANCE TIRES High performance tires are typically made with nylon overlay that enables the tires to achieve the designated speed rating and also enhance tire handling capabilities. Nylon material has memory retention and when stored for long periods of time without movement, may flatspot. With this in mind, the following steps should be taken to avoid flatspotting when vehicles equipped with high performance tires are not used for periods of time. ^ New vehicles should be stored with 44 psi in the tires. If the vehicle is operated, the air pressure should be reduced to the recommended operating pressure and then increased to 44 psi prior to being placed back into storage. ^ All vehicles stored for periods longer than 30 days, should be stored with 44 psi in the tires and be moved several feet at least once during each 30 day period so that a different portion of the tread contacts the ground.