Hey, if I remember right, they are the exact same compound as the Ra-1's just a more aggressive tread , I THINK haha. How come you are running so little width? GO WIIIIDEE!!! haha you should go 245 front and 265 back,OR 255 front and 265 back OR 255 ALL AROUND

all R-compounds run about 5-10mm wider than your normal street tires I believe, even the bridgestone Re-01r's run alittle wider than usual. But damn those tires are expensive haha The most commonly used R-compounds I see are the Toyo Ra-1's and the Nitto Nt-01's both really nice tires I've had both.
Nice car though man maybe I'll see you at this years Nasa events