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Old 01-07-10, 11:10 AM   #1
nbmtb
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Scary noise when standing and accelerating.

When I stand up to accelerate from a dead stop in a low (hard) gear I'll hear an awful clacking/cracking noise from below but with no way to determine where it's coming from exactly. I'm afraid something's going to break. Any ideas of what to check?
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Old 01-07-10, 01:19 PM   #2
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if you have a full suspension bike then that sound might be caused by a worn suspension pivot bearing. or the sound could be coming from your bottom bracket.
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Old 01-07-10, 02:11 PM   #3
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Sounds like BB needs lubed up, could also be chainring bolts or pedals.
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Old 01-07-10, 02:20 PM   #4
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BB disintegrated, get it serviced. someone has to look inside
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Old 01-07-10, 02:53 PM   #5
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Most likely the BB but I have also heard similar noises out of failing pedals.
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Old 01-07-10, 03:01 PM   #6
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None of the above.
it sounds like a rim flex same thing happened to me while I was trying couple of different rims so check your spokes and adjust them if necessary.
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Old 01-07-10, 04:37 PM   #7
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When I get this noise it's usually coming from my knees.

Failing that, grease the spindle-axle interface on a hollowtechII crank, if you have one.
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