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Old 11-18-11, 01:28 PM   #1
Telly
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Clunking noise driving me crazy!!!

Intermittent noises on a bike are the worst thing that can happen to anyone, and it's driving me crazy!

I bought a trekking/city bike a couple of months ago which I use for commuting to work which is around 10 miles both ways. Almost a week after I purchased the bike, I started to feel a "clunk" from what seemed to be the bottom bearings which started to get slightly worse. I took the bike to a LBS which took the B/B out, re-lubed it and the noise went away for a while, although I still slightly "felt" it through the pedals.

I again took the bike to another more reputable shop which double and triple checked everything and told me that the B/B, cranks and pedals are new and in top condition with no play in them.

Tonight I was coming back from work, with a bit more weight in the panniers (work clothes for the week), and after 3/4 on the way back, there was a loud clunking noise coming from the B/B which could also clearly be felt through the pedals.

All through the week when I was commuting to work without the panniers the bike was totally quiet, up to and including this morning.

I'm taking the bike to the LBS tomorrow morning, and would appreciate any input/idea on what this noise could be so I can ask the guy to check it out.
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Old 11-18-11, 01:51 PM   #2
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I had a chain stay crack on me once and it sounded/felt sort of how you describe -- clunking that felt like it was coming from BB/pedals. I was able to eliminate BB as problem but it took some doing to find the crack via visual inspection because with no weight on frame it was hard to see. I can't imagine that a slightly loose BB would cause more than an irritating creak so I would have shop look possible frame-related problems.
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Old 11-18-11, 01:57 PM   #3
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Or perhaps remove the pedals and slap on a set known to be good and see if that stops the noise. Every time I have had a noise that I couold 'feel' in my feet it was caused by the pedals, not the cranks.
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Old 11-18-11, 02:03 PM   #4
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Yeah, DCBO is on the right path. You almost have to diagnose by process of elimination. Bottom bracket, cranks, pedals, etc. It could also be something as obscure as a zipper tassel knocking up against the seat post or something like that (yes, that happened to me).
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Old 11-18-11, 02:46 PM   #5
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This is a very peculiar case since the noise is evident only when pedaling (quiets down when pedaling hard), and the bike itself feels sturdy. One thing that did come to mind is that the front derailleur needed adjustment, which was done last weekend and it's seems as though it's starting to go off track again, even though I never used it this week.
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Old 11-18-11, 04:34 PM   #6
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Take not if this happens in a particular gear of combo of gears also.
Could be the rear cassette has a defective sprocket or chain has a kink someplace will make clunking noises also.
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Old 11-18-11, 05:33 PM   #7
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I had a BB30 that clunked/clicked. It needed grease on the crankshaft where it rode in the inner races.
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Old 11-19-11, 04:37 AM   #8
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Just came back from the LBS and guess what, sometimes the butler really did do it! The casing of the B/B had come apart; instead of trying to explain, I uploaded a short video of it:

He swapped out the faulty B/B (RPM BB7420) with a Shimano UN26 and now everything seems to be working smoothly.

Thanks for everyone's advice on this!
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Old 11-19-11, 09:16 AM   #9
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Wow, never seen a cartridge BB come apart like that.
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Old 11-19-11, 02:02 PM   #10
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Quote:
Originally Posted by DOS View Post
Wow, never seen a cartridge BB come apart like that.
Neither have I, or the local LBS assistant. As for the new B/B, I just returned from a 25 mile run and although the first couple of miles it seemed tight (probably my idea though), the new B/B works great with no noise.
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Old 11-19-11, 05:15 PM   #11
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glad u got it solved - intermittent noises drive ya crazy
i was thinking pedals too
lol - i have had the coat tassle hassle deal happen too
also - one time it took me forever to find a noise caused by the non drive crank arm just nicking the kickstand
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