I believe the Hope M4 brake track is not as wide as the Avid. If this is the case, the pads will contact the disc arms and you may experience vibrations and/or noise; although, as an Avid user, you're possibly quite used to this. If you measure your pads, I can confirm whether or not they'll fit any particular Hope disc, as the M6 and V2 both use a wider track than the M4.
Can you post the measurement of the m4 width and possibly the X2 if you have it? I ordered those brakes and am trying to compare rotor width to my current avid rotors to see if they're similar
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