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UN55 Bottom Bracket

Old 09-06-20, 02:10 PM
  #1  
lhill 
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UN55 Bottom Bracket

Is it possible to damage a cartridge style BB by over torquing a crank arm? I am hearing and feeling in my feet a clicking noise only when I pedal and in either chainring or any cog.
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Old 09-06-20, 02:34 PM
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No.
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Old 09-06-20, 03:02 PM
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Bill Kapaun
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I could imagine over torquing a SQ. taper arm "could possibly" crack the square hole.
OR
Did you feel the bolt start to "give"?
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Old 09-06-20, 04:00 PM
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Those are pretty robust bottom brackets, so I doubt you could damage them.
Clicks and squeaks are annoying but try the "cheap" fixes first, like checking the chain ring bolts or swap out the pedals if you have a second set.
Although this is a point of great debate, I usually grease the tapered interface on the BBs.
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Old 09-06-20, 04:14 PM
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Just like any other clicks and things you hear, you need to track them down. Eliminate other possibilities when able.

Imagining while somewhat helpful, can lead you to focus too much on possibly the wrong thing.
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Old 09-06-20, 04:24 PM
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Thanks folks!
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Old 09-06-20, 06:43 PM
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Is yours a 73mm X 122.5, by any chance? I have an extra one around (new) if you can't find it anywhere.

I found that, when I first changed my BB-UN55 a few months ago, I had that same click. It turned out my crank was LOOSE, not over-tight. Once I gave it a turn with the ratchet, the noise went away and never returned.
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Old 09-07-20, 01:49 PM
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Thanks again all, this morning on a ride my bike was really making noises, even a squeak. At a stop, I jumped up and down on each pedal and all quiet until I grabbed the brakes and begun to rock forward and back. Itís then I realized the noise was coming from the headset. I went home and adjusted same......all quiet once again!
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Old 09-07-20, 02:11 PM
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It's NEVER the bottom bracket!
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Old 09-07-20, 06:41 PM
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It was never MY bottom bracket!😁
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Old 09-08-20, 02:49 PM
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Originally Posted by lhill View Post
Thanks again all, this morning on a ride my bike was really making noises, even a squeak. At a stop, I jumped up and down on each pedal and all quiet until I grabbed the brakes and begun to rock forward and back. Itís then I realized the noise was coming from the headset. I went home and adjusted same......all quiet once again!

Nothing more satisfying than finding the culprit!
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Old 09-08-20, 04:54 PM
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Love a happy ending
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