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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 09-03-08, 12:54 PM   #1
c0rpse
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Cracked BB Shell

There is a small crack in my non drive side BB shell. Its just a Shimano plastic one. Does anyone know how this could have happened? Also, can I buy a replacement or do I need to replace the whole BB? If I can get a replacement should I get a metal one? I think this may be the source of the creaking in my cranks.

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Old 09-03-08, 01:36 PM   #2
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perhaps you cranked it down too hard and it opened up over time.
if you can find a replacement cup go for it but i don't know where you would find one - i'm pretty sure they are all the same for the UN's..
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Old 09-03-08, 01:41 PM   #3
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Originally Posted by c0rpse View Post
There is a small crack in my non drive side BB shell. Its just a Shimano plastic one. Does anyone know how this could have happened? Also, can I buy a replacement or do I need to replace the whole BB? If I can get a replacement should I get a metal one? I think this may be the source of the creaking in my cranks.

Thanks

Your LBS should have a replacement cup. Generally those plastic cups are trouble free, although they occasionally crack. If the cracked cup was the source of the creak, the only way to find out is to install another one and see if that solves it.
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Old 09-03-08, 02:09 PM   #4
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I save the metal ones from the old BB's and use then instead of the plastic ones.
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Old 09-03-08, 07:08 PM   #5
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Which is completle unecessary if a decent mechanic installed it. The reason the plastic cups were introduced were to PREVENT noises.
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Old 09-03-08, 07:09 PM   #6
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There is a small crack in my non drive side BB shell. Its just a Shimano plastic one. Does anyone know how this could have happened? Also, can I buy a replacement or do I need to replace the whole BB? If I can get a replacement should I get a metal one? I think this may be the source of the creaking in my cranks.

Thanks
I wouldn't bother. Crack could've been from over-torquing or external damage.
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Old 09-03-08, 08:27 PM   #7
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Which is completle unecessary if a decent mechanic installed it. The reason the plastic cups were introduced were to PREVENT noises.
source needed
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