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bb wobble

Old 03-04-06, 06:10 PM
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Alexi
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bb wobble

hey yall, I'm rebuilding a 1951 grass track racer, I had to chase the threads on the bb to get a bb cup to thread in all the way, now after riding 2 weeks the bb moves up and down, it looks like is the cup that is moving. What can I do about this
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Old 03-04-06, 08:48 PM
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Are you sure you didn't chase an English shell with an Italian tap? Or start with an Italian bb shell? Italian cups are larger in diameter and an English bb will rock in them.
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Old 03-04-06, 11:50 PM
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yup it's english on english
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Old 03-05-06, 10:07 AM
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If the threads are correct and match the bb cups and the bb is now moving in the shell, I think there is a serious structural problem with the bb shell. I'd check for cracks.
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Old 03-05-06, 12:01 PM
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can you indentify the make of the bb shell or bike, what bb cups are you using? could be the cups simply came loose, but if you know how to chase threads i assume you know how to tighten a cup down properly.
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Old 03-05-06, 12:11 PM
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the bb shell is a nervex pro, the cups are miche track. Only 1 cup is rocking (the drive side) the other is fine.
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Old 03-05-06, 12:21 PM
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i don't remember exactly, since i haven't done one in a while, but miche bbs are like campy, the cups press on to the actual bearing-and-spindle unit, yeah? maybe you need to tighten down the nondrive side to make sure everything's seated.
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Old 03-05-06, 12:32 PM
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I re tightened everything last night, still wobbly. I'm gonna try some tefflon tape tonight.
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Old 03-06-06, 03:37 PM
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Use Loctite 222 low strength (purple) on the BB threads on assembly. This will prevent movemment and allow removal at a later date.
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