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Originally Posted by CrawfordGene
Maybe they changed the specs as to actual plies, but not as to ratings.
Gene
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Or a more skeptical view, they change the spec to match what's available at the price point they need to meet. There's no "performance wars" with ST tires, no competition based on milage, just price. Goodyear sees a market segment they can get a piece of and cash in on their brand name familiarity and dealer network. You pay a little more and they'll replace them if they pop. Most trailer tires just sit so they never have to worry about replacing them. This isn't to say the Marathons are better or worse than other ST tires. They're all made to (just barely) meet the spec. And the spec is so weak that hardly anyone would buy a passenger or truck tire like that. Go back and look at the comparision to the Yokohama 700x15LT. The truck tire is four pounds, about 14% heavier. Extra material means extra cost in manufacture. The ST tires, all of them, are pared down to the bare minimum.