surly old man
Join Date: Sep 2006
Location: Carlisle, PA
Bikes: IRO Mark V, Karate Monkey half fat, Trek 620 IGH, Cannondale 26/24 MTB, Amp Research B3, and more.
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Strange noises from BB's can be hard to silence sometimes. In my modest experience, aluminum frames are most prone to this. Not sure why, but maybe if the threads or facing are a tiny bit enough, then maybe the aluminum is soft enough to let the BB torque incrementally and make noise.
What to do?
-Make sure it is tight again. Even pros can make mistakes.
-Grease the hell out of the threads of the BB, including some grease on the faces themselves.
-Reface the frame.
-If desperate, swap out the BB. Maybe a different bunch of threads will interact differently with the frame.
-If desperate, tap the threads on the frame and the BB.
-If nothing else works, use Loctite on it. I realy hate this solution, but...
Also, make sure it is not the crank/spindle interface that is making the noise. And make sure the chainring/crank interface is not making the noise. And make sure it is not a chain/chainring interface noise. And pedal/crank interface. And pedal bearings.
Cross Check Nexus7, IRO Mark V, Trek 620 Nexus7, Karate Monkey half fat, IRO Model 19 fixed, Amp Research B3, Surly 1x1 half fat fixed, and more...