So I just got a wheel with a xtr center-lock hub (cheap/new from ebay). I tried to install a rotor using a Alligator 6-bolt adapter, and it didn't work out so well... I threaded the lock ring on by hand, but when I tried to tighten it, the lock-ring popped off at probably less than 2NM torque
The alligator lock-ring threads don't look damaged at all, and I tried it again with a standard cassette lock-ring and the same thing happened...
The lock-rings thread on with no resistance at all - they feel loose until they bottom out. The threads in the hub look deformed.
What do you think, did I really somehow manage to cross-thread the lock-ring by hand on my first try!? Is it possible the threads on the hub were defective to begin with? I don't remember there being any resistance threading it on, and I have removed and installed cassette lock-rings dozens of times with no problems. In fact, I don't think I have ever stripped a single thread before.
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