Attached are pics of using Raybestos ST-43’s with stock rotors (Motul 600 brake fluid). The stress cracks are only on the outside surface of the rotors. The inside surface show some cracks but not as severe, perhaps due to more air being directed to inside surface from the angled dust shield.

I love these pads however I only managed to get 2 events out of them before my rotors started to look like a dried up riverbed. Looks like I’m going back to the tried and true Porterfield R4 until I fab up some ducting.

So I should probably toss these rotors before my next event, right?