That is the thing, both Tire rack and UK tyre review puts PS31 as UHP Summer.I think Ps31 is more like entry level performance, while v12e2 is true uhp.
Then Tire rack put V12evo2 in Max and S1 Evo2 in UHP, whereas Tyre review puts S1evo2 in Max and V12evo2 in UHP.......lol