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Noise like small bits in the drivetrain whilst pedaling on my fluid trainer, only when ON the bike WHILE pedaling. Unable to produce sound running the cranks on the maintenance stand and listening. No other appreciable root cause - help!

Thanks!
 

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Noise like small bits in the drivetrain whilst pedaling on my fluid trainer, only when ON the bike WHILE pedaling. Unable to produce sound running the cranks on the maintenance stand and listening. No other appreciable root cause - help!
Two symptoms show your BB to be going bad: lateral play that cannot be adjusted away or binding/grittiness when you turn the axle slowly with your fingers. Other noises are most likely due to improper lube during installtion and of course the noise could well be coming from someplace else.
 
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