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The walls are much stiffer than ST tires.
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but It's my conclusion that LT tires have stronger side walls and therefore make more sense for better durability in our application..
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This gets repeated a lot but every manufacturer or vendor website I've ever seen that has comments on the subject says that ST tires typically are designed to have stronger sidewalls than LT or P radials to accommodate the side-stresses common to trailer applications. Can someone point me to even a single instance of a manufacturer or vendor saying otherwise? And don't mean one of the many 'opinion' sites but one backed by a tire manufacturer.
That said, the 'stronger sidewall' comment may be true
specifically with regard to the Michelin ribs because as a commercial truck tire they have an all-steel carcass. But that characteristic is far from common, in fact very rare on a non-commercial tire, LT or otherwise.