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Noise in bottom bracket

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Noise in bottom bracket

Old 09-23-08, 07:08 AM
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Noise in bottom bracket

I've had what sounds like grinding in my bottom bracket for several weeks. It's not a constant noise though. I've taken it in to a shop and they've found bad bearings in a rear wheel, bad bearings in pedals (under warranty) but they haven't found the source of the noise. Unfortunately it only seems to show up after I've ridden for 7 or 8 miles. There's no noise when I first start riding, so the shop won't hear it when I bring it in. They haven't found any play in the cranks, and the crank arm bolts seem tight. Anybody ever have a similar issue?
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Old 09-23-08, 10:34 AM
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wow, theres nothing like an extremely intermmitent problem to keep the lbs wondering. if your sure its in your bb, do you have the knowledge to do a rebuild yourself? sure its from the bb and not anything like your deraillurs as unlikely as it may be? id do the rebuild thing and closly check the bearings, bearing cups and axle as i do the rebuild to check for any damage or unnormal wear. if the lbs can't find any problem then you are gonna have to dig in there yourself and get to the root cause of your problem. a good crank puller and the right set of wrenchs should get you in. check to see if any other specialized tools will be needed for your application.
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