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 Post subject: Bottom Bracket Question
PostPosted: Thu Aug 02, 2007 12:14 am 
98+ BoTM | BoTM | Gold | Rider
98+ BoTM | BoTM | Gold | Rider
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Joined: Thu Mar 23, 2006 12:48 am
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Location: Kingdom of Ringlé
I'm looking at a UN-71 BB on Ebay and wondering whether it's the right tool for the job..

What is the difference between this model and the UN-72 mentioned in the Most durable long lasting parts thread?

Does it have a hollow spindle?

Also, at 68/110mm is it good for low profile cranks?

Many thanks in advance :wink:

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 Post subject:
PostPosted: Thu Aug 02, 2007 12:41 am 
retrobike rider / Gold Trader
retrobike rider / Gold Trader

Joined: Sat Jul 21, 2007 9:48 am
Posts: 6980
Location: Bristle
i have a UN71, had it since 97, it's been in most of the frame's i've owned since, and it was second-hand when i got it. to put this in perspective, i can kill an LP26 (basic shimano cartridge) in less than a fortnight

110 is a fairly typical compact drive axle length - my 98 LX's (the weirdy four arm ones) sit on a 110 i think


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PostPosted: Thu Aug 02, 2007 9:16 am 
BoTM Winner / retrobike rider
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kingroon wrote:
Also, at 68/110mm is it good for low profile cranks?


perfecto for M900 cranks!


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 Post subject:
PostPosted: Thu Aug 02, 2007 9:23 am 
Concours Judge
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I think 68/110 is ok if your frame is not very wide. Of course be sure the BB housing is 68 and not 73.

I know people who experienced multple times the older non cartridge BBs were sturdier. The XTs with silver spindle. I never had an issue with them.


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PostPosted: Fri Aug 03, 2007 12:05 am 
98+ BoTM | BoTM | Gold | Rider
98+ BoTM | BoTM | Gold | Rider
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MadCowKev wrote:
kingroon wrote:
Also, at 68/110mm is it good for low profile cranks?


perfecto for M900 cranks!


Bewdy, so perfecto for M737 too.. :?:

Cheers Melv, yeah I'll have to check the BB housing, but pretty sure it's a 68mm..


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 Post subject:
PostPosted: Fri Aug 03, 2007 2:03 am 
Retro Guru
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Joined: Sat Sep 09, 2006 6:00 am
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Location: Melbourne, Australia
M900 is designed to be used with a 107mm spindle.

From memory, M737's are designed to be used with a 110 so it should be sweet 'Roon.


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 Post subject:
PostPosted: Mon Aug 06, 2007 11:49 am 
98+ BoTM | BoTM | Gold | Rider
98+ BoTM | BoTM | Gold | Rider
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Joined: Thu Mar 23, 2006 12:48 am
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Location: Kingdom of Ringlé
Eesh.. Got outsniped:shock:


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 Post subject:
PostPosted: Mon Aug 06, 2007 11:57 am 
BoTM Winner / retrobike rider
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kingroon wrote:
Eesh.. Got [url=http://rover.ebay.com/rover/1/705-10061-5969-5/1?:


how much is $50 (Aus)? You can get a new UN-54 (just as good) for £16 posted in UK from www.mawracing.com!


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 Post subject:
PostPosted: Mon Aug 06, 2007 12:04 pm 
98+ BoTM | BoTM | Gold | Rider
98+ BoTM | BoTM | Gold | Rider
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Joined: Thu Mar 23, 2006 12:48 am
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Location: Kingdom of Ringlé
MadCowKev wrote:
kingroon wrote:
Eesh.. Got [url=http://rover.ebay.com/rover/1/705-10061-5969-5/1?:


how much is $50 (Aus)? You can get a new UN-54 (just as good) for £16 posted in UK from www.mawracing.com!


At the moment it's about GBP21.. Can't believe it went so high.. It even has a plastic driveside sleeve :roll:


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 Post subject:
PostPosted: Mon Aug 06, 2007 8:27 pm 
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Joined: Sun Jul 16, 2006 3:28 pm
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Location: The Netherlands
If you need one. I have a 68/107 BB-UN52
And a BB-UN71 but I'm planning to keep it myself :)
Also have one in my steel city cruiser, but don't know the type.


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