Are you talking about the v6? Because in the Specs manual and the Salesperson brochure, they both say that the SS is getting "245/45 ZR20
Pirelli summer tire (front), 275/40
ZR20 Pirelli summer tire (rear)"
On pirelli's website, they dont have all the sizes listed. But, I downloaded the data sheet for the pzero(
HERE) and it doesn't have both the front size listed, only the rear.
But, more importantly, the rear size (275/40ZR20) IS listed as runflat.
So unless Pirelli is coming out with a new size (245/45ZR20), I dont know what is going on. The closest they have is 245/45/ZR19, which is too small for the 20" rims on the SS. More good news, the 19' version is runflat, so maybe the new 20" will be too. We can only hope.
And another thing, Dave, you are right. The sizes listed in the spec manual and brochure for the v6 are not listed in the data sheets for the pzero tires. This could mean that pirelli has not even publically released the tires being used on the v6 or the front of the v8.