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Advice on bottom bracket sealed bearing Shimano BB-UN73

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Advice on bottom bracket sealed bearing Shimano BB-UN73

Old 10-08-10, 09:16 PM
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Advice on bottom bracket sealed bearing Shimano BB-UN73

Hi,
could someone give me some technical data on Shimano bottom bracket sealed bearings please ?
I have a GT Agressor 2007 model on which I replaced the original BB bearings with a Shimano BB-UN73

(additional info on unit is

68

BC 1.37x24

L <- LL113 -> R

)

this was some time ago. Now I want to replace the same original BB on my partner's GT agressor and I was trawling thru the Shimano tech site and also Parktool's site. I read something about this unit being out of date and being replaced with a new part number. It also said that the number after the UN refers to the weight of the unit, with higher numbers being lighter ?
Is this correct ?
what does the LL113 refer to ?
can someone point me to a better informational site than the Shimano page ?
Thanks
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Old 10-08-10, 09:55 PM
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BB-UN54 would be one replacement.

"68" refers to the width of the frame's bb shell.
1.37x24 is the threading ("English")
"113" is the width of the spindle in mm

read https://www.sheldonbrown.com/bbsize.html
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Old 06-21-23, 07:51 AM
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Originally Posted by greywolf271
Hi,
could someone give me some technical data on Shimano bottom bracket sealed bearings please ?
I have a GT Agressor 2007 model on which I replaced the original BB bearings with a Shimano BB-UN73

(additional info on unit is

68

BC 1.37x24

L <- LL113 -> R

)

this was some time ago. Now I want to replace the same original BB on my partner's GT agressor and I was trawling thru the Shimano tech site and also Parktool's site. I read something about this unit being out of date and being replaced with a new part number. It also said that the number after the UN refers to the weight of the unit, with higher numbers being lighter ?
Is this correct ?
what does the LL113 refer to ?
can someone point me to a better informational site than the Shimano page ?
Thanks
I use to have the same model do they still make them?
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Old 06-21-23, 09:08 AM
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Originally Posted by iventilation
I use to have the same model do they still make them?
I have a couple of the same model in 115mm length including one that is still NIB. They have been out of production for many years.
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Old 06-21-23, 07:20 PM
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Tange may have a suitable replacement:
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Old 06-21-23, 07:42 PM
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Originally Posted by iventilation
I use to have the same model do they still make them?
Keep in mind this is a thread from 13 YEARS ago and wasn't very active then and hasn't been active since. Please take a look at the thread dates or when you go through the forums just look at most recent stuff which will generally be that first page or top posts.

They do not make that same model. If you are stuck on Shimano the UN-300 is their replacement. However I would go with the IRD QB-95 or a SKF bottom bracket if I wanted something more high quality or one of the other IRD BBs or Tange or something like that if I wanted something a bit cheeper and not Shimano.
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Old 06-22-23, 08:35 AM
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You've double checked that your partner's BB is the same haven't you? If they have a different tier level model of that bike, then the BB shell might be different. Even if the cranks are the same, it could be the difference between a press fit or a threaded BB. But that is probably less likely than if the cranks are different.

Crap, a zombie thread!

This will have been a nice discussion if the necro reviver had ask in their own new thread. Now quite a few of us others will just add responses to the original OP and others not really addressing the question ask by the noob.

Oh well. Welcome to BF!

Last edited by Iride01; 06-22-23 at 08:42 AM.
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