Bottom Bracket Question

kingroon · Aug 2, 2007

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

cce · Aug 2, 2007

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

JustKev · Aug 2, 2007

kingroon":2gvqxg3l said:
Also, at 68/110mm is it good for low profile cranks?

perfecto for M900 cranks!

Elev12k · Aug 2, 2007

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.

kingroon · Aug 3, 2007

MadCowKev":2zrkuxu4 said:
kingroon":2zrkuxu4 said:

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

Click to expand...

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..

Arran · Aug 3, 2007

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.

kingroon · Aug 6, 2007

Eesh.. Got outsniped:shock:

JustKev · Aug 6, 2007

kingroon":1kpd7vus said:
Eesh.. Got

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

kingroon · Aug 6, 2007

MadCowKev":1ahuag9z said:
kingroon":1ahuag9z said:

Eesh.. Got

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

Click to expand...

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

LTS Biker · Aug 6, 2007

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.

Bottom Bracket Question

kingroon

cce

JustKev

Elev12k

kingroon

Arran

Senior Retro Guru

kingroon

JustKev

kingroon

LTS Biker

Senior Retro Guru

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