I think a 20.3 or 22 rotor would make a difference in power and heat resistance. But at home I prefer 18 rotors. 20.3 and 22 bend fast, so have to true them after a few rides. 18 stays straight. I will also change the Sram rotors for magura MDRP (good price)or Brake stuff(expensive but work very well with organic pads because they have so many small holes).