Originally, I used an adapter on my 6-bolt rotors, which appeared to be warped out of the box, with no amount of bending would eliminate completely the occasional 'ching-ching-ching' of disc brake resonance. I upgraded to this in hope of eliminating this annoying noise, but it also rubs occasionally, and also appears slightly warped at exactly the same spot as the 6-bolt rotor rubbed. The rotor is stamped with a directional arrow that somehow during production causes a slight warp on the rotor. Not horrible, but sometimes annoying. The brakes function great, but sometimes I wish I'd chosen the rim brake option to this setup.