Your brake pads and rotors last longer and your brakes work better, if you jack up one end of the bike at a time, hand spin the wheel and run a mechanics stone over the working portion of the rotors. My rotors have many miles on them, no lip on the perimeter, and they are almost as smooth as new. Ian gets incredible miles on a chain/sprocket set, I do the same with pads and rotors. BTW, since I quit oiling my chain, it's wearing much slower too, thanks, Ian.