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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 08-07-05, 05:21 PM   #1
shoerhino
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So I was cleaning up my bike today and I noticed that the part I always assumed was the dust cover was loose on my bike. That seemed bad so in order to get a better view of the problem, I pulled the crank and took a look.

My question is: What is the notched part I'm holding to the left of the crank (I always persumed it to be part of a dust cover)? Why does it appear to me that this is somehow sheered off? What do you do about that?

I'm never dealt with a bottom bracket before but I can do almost anything else...

Tim

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Old 08-07-05, 05:52 PM   #2
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It is sheared off. It isn't a 'dust cover', but part of the cartridge. I have never seen that before. There may be issues getting that mess out of there. Removal of the non drive side cup may allow the cartidge to be driven out the nondrive side,and then the remains of the cup can be cut and pried out.
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Old 08-07-05, 05:57 PM   #3
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How funny; I was replying at the exact same time as you, sydney, and yours prevented mine from going through. I said the exact same thing, including the fact that I've never seen that before, either.

Talk about gorillas building bikes..!
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Old 08-07-05, 06:14 PM   #4
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Thanks guys! I've noticed several problems with too much torque on this bike... I'll go back to my LBS and let them straighten this out. Hopefully they'll help me out.
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Old 08-07-05, 07:56 PM   #5
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Can I ask a follwup question? One item I did not take a picture of was the spacer that was used with this bottom bracket. In between the broken end of the cartridge and the frame was a metal spacer.

My bike is a 2004 Trek 2100 with a bontrager race crank. Does anyone know if this configuration requires a spacer for the bottom bracket? Is that normal to need a spacer? Could that have contribute to the problem?

Tim
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Old 08-07-05, 09:15 PM   #6
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Quote:
Originally Posted by shoerhino
Can I ask a follwup question? One item I did not take a picture of was the spacer that was used with this bottom bracket. In between the broken end of the cartridge and the frame was a metal spacer.

My bike is a 2004 Trek 2100 with a bontrager race crank. Does anyone know if this configuration requires a spacer for the bottom bracket? Is that normal to need a spacer? Could that have contribute to the problem?

Tim
If it was just a thin metal disc, it was likely supposed to be there. Trek used tham on the OVLV frames to help mitigate damage from a dropped chain.
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Old 08-08-05, 08:22 AM   #7
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Some Raceface BBs are designed to be used w/ either 68mm or 73mm shells, and employ a spacer to be used on the 68. Could be this?
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Old 08-12-05, 06:55 PM   #8
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I took it to the LBS on Monday and thankfully, they were able to carefully thread the broken bottom bracket cup out of the frame without much difficulty. They talked to the manufacturer of the bottom bracket (truvativ) for me and they replaced the bottom bracket for free.

LBS saves the day (again)! Thanks for all the help. Between the advice I received on this forum and watching the mechanic at the LBS, I think I could replace my own bottom bracket next time.
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