TYRE COMPARISON: Michelin Pilot Sport 4 S vs Pirelli P Zero PZ4

[Gregs24]

The compound is strictly related to the temperature (none have reinvented the wheel.. as of yet), so when you compare two tires and you see that they are equally performing in the "hot", but one is performing a little better than the other in the "cold", you expect (that's why i said "counterintuitive") that the latter will equally perform a little better in the rain (because of the temperature), IF it was just about the compound, so you can't say that the tread design isn't playing a role here (or at least that's what I think).
But again, since we're talking about two vehicles (S550 vs S650) I may find that the S650 has the suspension tuned differently (ie: more rigid) and it's all about the car mechanics than the tires, and so I may find that the PS4S will equally perform "worse" in the wet (if compared with my previous experience), if mounted on this car (I will find when I'll change em). Can't say more than what I've experienced so far... the rest is merely speculations.

I would read the article - it doesn't match what you are suggesting

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[npole]

I would read the article - it doesn't match what you are suggesting

The article explains exactly (related to the compound) why a tire that would perform good in the wet, wouldn't perform equally good on "hot" asphalt, and also why the compound is strictly related to the temperature. That isn't the case we're discussing: the PZ4 perform as good as the PS4S while "hot", performs a little better when "cold", but performs worse on a wet surface (not depending by the temperature), so it's not just the compound, it's also the tread design (but it's also possible because of the different vehicles setups, as mentioned in the previous post). Again, will make a proper comparison once I'll mount the PS4S back.