BB bracket - did I get a defective one, how do you read "L<- D-NL -> R"
06-28-15, 09:07 PM
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Okay, now I'm really interested -- what brand? No Shimano cartridge BBs I know of are rebuildable.
06-29-15, 03:40 AM
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if you mean break it down, pop the bearing seals and repack the bearings with fresh grease, it can be done. my local bearing house could not find a listing for the bearing size used in bb, so they are special non-standard size.
06-29-15, 08:40 AM
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06-29-15, 09:15 AM
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Interesting. I wonder if that was an abandoned early version of the cartridge type BB, included for completeness. I've never seen one either, and this page offers more confirmation (if any should be needed) as to which end goes where if "L" and "R" are marked.
If anyone can find datasheets for these reversed-style BBs, I'd be interested to see them.
If anyone can find datasheets for these reversed-style BBs, I'd be interested to see them.
06-29-15, 09:24 AM
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I mean they have a conventional cone and locknut on one side and the seals can be removed without damage. I think the balls are a standard size.
06-29-15, 09:34 AM
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Thank you! That helped lead me to some LP25 datasheets, and a video for repacking the LP20. Interesting beast.
06-29-15, 09:39 AM
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No. Not Italian thread. Italian thread has a wider diameter than English, so you wouldn't get any thread engagement -- it would just drop in.
I suspect you're just a victim of variation in manufacturing tolerances. Chasing the threads in the BB shell would likely help.
I suspect you're just a victim of variation in manufacturing tolerances. Chasing the threads in the BB shell would likely help.
06-29-15, 10:56 AM
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I second dr1445's practice of partially installing the NDS cup first. It helps to support the spindle as you insert the unit from the drive side and actually helps to prevent cross threading the DS cup. After you torque down the DS fixed up, you go back to fully inserting the NDS cup and torque to specs.
06-29-15, 01:42 PM
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06-29-15, 04:09 PM
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I learned something, but I stand by my word for the OP. He bought a UN55, so there's no reason to tell him to try installing his backward. Having the frame threads chased is still the best bet if it won't install without a fight.
06-29-15, 05:33 PM
#37
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it was just a suggestion . thinking maybe the op was putting it in wrong since they said it was hard turning in . plus mgr. have been known to mess thing up before .
06-29-15, 05:59 PM
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Shimano CT90 and CS11 cartridges also install from the NDS but I don't know if they are rebuildable. I suspect several others also install that way.
06-29-15, 09:55 PM
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Fair enough. I apologize for being so harsh earlier, it was just hard to believe that they would risk this confusion when they didn't have to.
06-29-15, 10:09 PM
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I thank you ThermionicScott for your apologize and I agree with you about that . Things do happen and I have see a lot in my 30 's years of serving bicycle repairs . Thank you again .
