The rotors were the excat diameter and thickness as stock, when I changed them out i did a visual comparsion...i didn't mic them so there might have been a small difference but not enough to matter. The new pads I'm sure had some hand in it, but i dont think i wouldve gotten the kind of braking I was getting with the metallic pads and stock type rotors. Yeah i did change a lot...kind of wishing I had done some actual tests now instead of the seat of the pants test. Anyone wanna donate a set of rotors and pads??? lol....anyways; I will say that cross drilled do take longer to break in than do stock rotors I noticed that first off, it took one good hard run down the back roads after setting the pads to the rotors for them to get good.