If I were you, A, I would check the spokes first since if the magnets are "loose", the bike should not run smoothly. I had a similar noise after riding my DD rear hub a few times, and tightening all the spokes about 1/4 of a turn (AIR) eliminated the noise. I've had to tighten them once more during the three years that I've had the system. Twelve gauge spokes which are used on many Chinese wheel builds are notorious for becoming loose with use.
Last edited by 2old; 07-31-18 at 10:51 PM.