Don,
Sounds like 5 year old tires left in sun full time? If so, chalk that up to experience and protect the new ones (you will be motivated once you swipe your card). If you kept these tires covered, challenge michelin.
BTW, why are you looking to change size, what is your objective?
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American Revolution 40L CAT C9
Samsung 197, TireMinder, Ready Brute Elite with Wrangler
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