I need front rotors. I can't see spending $500 on two peice's of steel. Has anyone purchased the cheap one's from e-bay from china or wherever they are for $180 a pair? How bad could they be. I don't wan't to buy them and there crap after one season or less. I don't wan't to buy a used set of stock one's and put them on the bike and they pulsate after a few month's again. Any advice? Thank's.