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Both mine and my girlfriends bikes have centerlock rotors, they kept coming loose on my bike (but not hers) so I used mid strength loctite on the threaded collars. Now every time I get dirt or a stone in my brakes when I'm going down a trail and it makes a ching-ching-ching noise I think "oh fuck my rotors loose again" and stop and check it. For this reason, I think they fucking suck. Also they dont look as good as 6 bolt rotors, in the XT series at least. See pic related.