from the wording in the pirelli information, it sounds like they’ve used LT compounds(more resistant to stone chips etc). on a pmetric carcass.Looks like LT is out and passenger vehicle is in. This definitely explains why on-road performance is sporty and responsive. I'm sure they did this for ride quality and noise as well. Not a bad option, but for those going off-road (rocks) you will want LT tires or you have a much higher likelihood of having a blowout, as we saw in the reviews.
The primary difference with LT tires is load rating. You can carry more weight at higher pressures.