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Mine did the same on the fronts with about the same track use with the Cryo treatment on OEM 97 rotors. But then I was seeing temps close to 500F on the fronts and 600+F in the rears with Carbotech Panther Plus pads and Dali deflectors on the front without the dust shield on the front. Small stress crack is normal and OK to drive on the streets, but if they reach the edge, or widen enough that you can catch them with your nail, then you need to discard them.I now use the 2 piece DaliRacing floating rotors (the original template) which did not have Cryo treatment. After some 4-5 track events and similar temps, they are holding quite well. YMMV.
Mine did the same on the fronts with about the same track use with the Cryo treatment on OEM 97 rotors. But then I was seeing temps close to 500F on the fronts and 600+F in the rears with Carbotech Panther Plus pads and Dali deflectors on the front without the dust shield on the front. Small stress crack is normal and OK to drive on the streets, but if they reach the edge, or widen enough that you can catch them with your nail, then you need to discard them.
I now use the 2 piece DaliRacing floating rotors (the original template) which did not have Cryo treatment. After some 4-5 track events and similar temps, they are holding quite well. YMMV.
