Cheers guys, i think its fair to say these tyres gave been thru many heat cycles and im guessing they will offer less grip than a good semi. Its probably worth noting ive never driven on semis and have only done one track day at QR and am using these tyres because they are cheap to practice on and can handle 5 hot lap sessions.
I think the guards are going to need rolling min. On a side note i think the rims these 24/64-18 tyres come off are 9 inch wide, the '11 car has 9.5s on the front but uses the same tyre.