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Ode to UN55 BB

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Ode to UN55 BB

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Old 05-20-21, 07:12 PM
  #26  
RubeRad
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Hmmm, I think that might be funny...
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Old 05-21-21, 05:14 AM
  #27  
John Valuk
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Originally Posted by ShannonM
Given the fact that Tange made the UN55, (along with every other Shimano bottom bracket I know of,) I'd not be surprised to learn that the QB55 is the exact same part.
I don't think that they are in fact the exact same part.

The IRD QB-55 (and -75, and -95) uses a pair of sealed bearing cartridge assemblies.

I think that the UN55 uses an arrangement where balls are in direct contact with bearing surfaces on the spindle and the shell of the cartridge. See details in this thread: Repacking a Shimano BB-UN55.
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Old 05-24-21, 02:04 AM
  #28  
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Originally Posted by RubeRad
That doesn't help. I did screw the DS in first and tighten, and then screwed the NDS cup in, and without a lip there's no definitive point at which it is 'tight'. But now I'm repeating myself...
You aren't trying to screw a 68mm BB into a 73mm frame are you?
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Old 05-24-21, 09:15 AM
  #29  
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pretty sure not, but hey, I'm dumb enough not to recognize a plastic clip when I see one

In any case, it's already installed and working fine, albeit with possibly the risk of the NDS being inserted too far/tight or not far/tight enough and destroying itself or working loose.
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