You mean superstock? Don't think they're legal. From the rulebook, "Brake rotors may be changed to OEM spec steel rotors. No carbon fiber, cast iron or other exotic materials unless stock. No oversized rotors."
Doesn't this revert to the concept: "If the rulebook doesn't implicitly permit the use, it by default prohibits the use" or something like that? -Wish
The if it doesn't say it you can't do it rule isn't necessary here - the rotor rule covers it. They are not OEM spec so they are illegal. The reasoning as to not allowing them is that they have less metal and make the bike easier to steer, hence a performce advantage.
