The solid cast rotors have been known to get hot and crack/bust. Be more afraid it would do that then the problem I've had so far with mine. Guess I'm going to have a machine shop turn down the outside just a little bit and run it again. Take my Go pro and see exactly what's happening.Have you guys considered running a solid steel vented rotor verses one with the aluminum spacer,seems the spacer is expanding more due to heat and contacting your caliper. I posted a tread under the Uas tab because of your very issue and found a couple places with the solid steel, vented rotor.