Originally Posted by juld0zer

i vowed never to buy slotted rotors again after i had them on my Mazda because they seemed to attract said or small rocks which get lodged in the slot then gets picked up by the pad and scores an ugly ring in the rotor. happened to me 6 times on the Mazda and currently it's happened to one of my Z's slotted rotors (which i got for a bargain).

so larger rocks being slung around by the wheels is not to be ruled out. good luck!