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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 06-01-09, 01:40 PM   #1
couchman
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campy BB - noise

I noticed a sound while coasting. It just started.
Its a sort of oscillating noise that sounds like something rubbing.

I put the bike on the stand and cranked the pedals around fast. When I stop spinning the pedals, the sound starts again, but not in every pedal position, I have to slowly move the pedal until I find it. It is obvious once found as it is kinda loud.

I also checked the wheel. Nothing seems to be rubbing.

The only thing I can think of is the cups ? Could the rubbing be in there? Should I pull it apart and repack it?

campy 10 speed cf cranks UT BB. Pretty sure it's an 07 model.

thanks in advance
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Old 06-01-09, 03:54 PM   #2
DaveSSS
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The BB can't make noise when you're coasting, but the freewheel mechanism could.

If the bike has quite a few miles on it, have you ever removed the crank to service the bearings, like the instructions tell you too?

Most of the complaints I've read about the UT crank have to do with improper installation of the cups. It seems that people don't bother to check that the BB faces are square to the threads and the BB width is 67.2-68.8mm wide. If the cups are installed with loctite 222 and not tightened adequately, problems are likely to occur. Campy forgot to include the removal of the factory applied thread locker if loctite is used. Having both materials on the cups won't work correctly. I guess they expect people to read the loctite instructions that say the threads must be clean, dry and free of foreign material before applying it.
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