JOS

Please have a look at the picture, I have developed some nice cracks in the front rotors, I know on standard road cars Porsche says 7mm crack is allowed.
This is about that, but no one is going to the outer circumferance so far, or between holes.
I have new slotted Cayenne rotors at home, but just asking to get the picture, beginner as I am
Car is a 2004 cup with 350mm fronts.

Rickard 993 Turbo

Steve113

You could get away with them for a little bit but why ? The slotted work better and you already own them. Keep these as spares and put on the new ones

JOS

Follow up, I put the new rotors on, or no I tried, they had 15,2mm holes, needs to be 16,2mm. Drilled those up and also added guide hole for the small 6mm screw.
Put the wheels back on, turns out the 3mm spacers and the new rotors makes the axle too short to be able to fit the safety clip on again, had to take the spacers out. The center on the Cayenne are 1mm thicker...
Well, lets see how they work now!