Originally Posted by mstephens
I may have forget the "X" when I typed. The set I bought were Michelin 235/75R15 LTX M/S. You can look at them here: LTX M/S2 | Michelin Tires
Michelin refers to them as tires for light truck and SUV.
You most likely bought your tires before Michelin discontinued the model. Follow your link, click on "specs" (top center), you will see that the only tire in the size you quote is "part #36210 -- P235/75R15/XL 108 T". Sadly there is no LT...R15 in the list. My tire shop checked with the Michelin rep.
We can, of course, speculate whether the P models actually differ from the LT models or whether that's just a marketing gimmick... I honestly have no idea...