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Mark N., putting plastic under the tires between the tire and whatever surface they sit on is an additional measure to prevent long term rotting. While ever so minute, there's been some evidence that a tire sitting on a surface, like concrete, for long periods and they might wick and weaken over time as the two surfaces are in contact. I've read some experts recommend you park your tires on plastic placemats (there are supposed to be the correct size for coverage of the pad of rubber on each tire and of a material that prevents this problem) and avoid this. Even knowing this I have not done this, but probably should. However, my Marathons are still doing okay after 5 years and this would just be another step to add, document or remember so I've done without the extra effort.
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