I'm interested in new rotors.. I got alligator serrated to save weight but i notice heat fade very quickly on steep descents less than a quarter-mile long. They brake noisily but saves 40 grams over roundactagons and stays cleaner. this is a 160mm rotor on a 700c cyclocross wheelset so i'm sure it introduces more torque into the equation than on a 26" mtb due to the larger radius.