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The Sailun tire is a S637, which is the model of the tire. There are now two sizes, the 80 series and the 85 series. Both of those tires are ST, Special Trailer, so which ever one of the sizes you bought, they are both good. The original size, the 85 size was an LT tire, still exactly the same as the new ST tire, just Sailun dodging an import tariff that is now imposed on LT tires, but not ST tires.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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