Just wanted to know if the noise coming from my tires could be warped rotors. I had Yokohama tires installed in May '03 and new EBC greenstuff brake pads installed in August '03. I think my tire alignment is good. When I had my brake pads replaced, they told me I needed new rotors. The tires look great, so could it be the rotors? Let me know what you guys think. How often should we replace bmw oem rotors?