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Old 05-13-09, 10:40 AM   #1
cmberes
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Irregular BB?

I have an '09 Madone project 1 that my team got a good deal on. After about 500 miles or so I noticed some noise coming from the bottom bracket and after looking closer I realized the crank arms were slightly loose. After taking it to the shop and letting the mechanic take a look, he decided the bottom bracket was slightly ovalized. This would be a factory defect and the frame would have to be replaced. A couple days later, however, the Trek sales rep. was in the shop and he said that there was "a small number" of Madones made with a slightly larger bb shell than normal and that Trek makes oversized bearings to fit it. Has anyone heard of this?

My thought is, the frames were a mistake and they made the bearings after realizing the mistake because it's cheaper than replacing all the frames. In which case, why should I trust that the replacement bearings will fit properly? Seems strange and I can't find info anywhere about this issue. Aside from this bit of bad luck, the bike is great.
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Old 05-13-09, 08:15 PM   #2
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OS bearings to fit out of tolerance BB shells? Sounds like a load of sh1t to me. I'd request a new frame.
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Old 05-14-09, 05:15 AM   #3
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smells very fishy

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Old 05-14-09, 05:44 AM   #4
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Originally Posted by fatallightning View Post
OS bearings to fit out of tolerance BB shells? Sounds like a load of sh1t to me. I'd request a new frame.
+1

Especially since down the line it is going to be impossible to find these "special" bearings.
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Old 10-16-09, 07:29 PM   #5
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I just got an oversize bearing put into my '09 Madone BB, sure would like to know if this turned out to be a 'defective' frame.
Did you pursue this with Trek?
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Old 10-16-09, 07:35 PM   #6
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Racing?
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Old 10-19-09, 06:16 AM   #7
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no, not racing, after 10,000 miles i noticed some play in the BB, the rebuild kit needed an oversize bearing on the non drive side, perhaps a mfg defect as stated by "cmberes" (OP). Wondering if Trek has admitted to faulty manufacturing.
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Old 10-21-09, 06:37 PM   #8
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Also bear in mind that the BB itself may be substandard if it was manufactured in the Shimano Singapore factory.

I live near Singapore, and local bike shops drawers are replete with their prematurely junked BBs.

It has come to the point, if you want to be sure of a decent Shimano BB, you have to get somebody to buy it IN Japan.


It is a long standing problem with their quality control.
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