XPS Used to be available in an M+S designation, I was going to buy some once but they did not come in my size (225/75/16). I just looked on the Michelin website and I see now they make what they call an "XPS Traction"
HereThe new "Traction" does not come in my size either. I can tell you from experience that the Rib is pretty slick. If you get caught in rain or snow you have to be
extra carful.
Also, I noticed Michelin now gives the Rib a speed rating of "Q" that says it is good for 99 mph, they used to state they were only good for 75.