PS2's are an Ultra HPS >summer< tire... and not recommended in cold weather climates. There is no '4 season' about them.
In respect to a 245x40x18 on a 18x8 on the daily driver.
Hot and dry, like here in Vegas... they are very predictable, even on the threshold. They exhibit gentile departure characteristics at the slip rate and come right back to you with light steering input. However, they suck in cold weather... and do not drive them in a spirited manner with standing water or in sluury/snowy conditions. Not very forgiving by any means with a chassis that isn't very compliant.
In my opinion, the PSS tire overall... is even better than the PS2 in hot and dry climates with the same characteristics noted above. Don't get me wrong... I LOVE my PS2's... but the "driver" will be seeing a new set of PSS's in about another 10-12k miles of my level of abuse. Which seems to be just about every time I strap the car on.
Another thing with both of the Michelin offerings... then tend to 'tramline' noticeably on concrete surfaces.
On another note: I too am somewhat interested in thrashing a set of Rivals. I have had excellent results with BFG's product line.
Tough decision...
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