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PostPosted: Wed Jul 27, 2011 8:50 am 
Gold Trader
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Location: Bracknell,East Berkshire.
You were doing fine until the last bit about tightening and loosening bbs. Right hand side is tightened anticlockwise - left clockwise; as illustrated by the pic directly above.
6/10 :lol:


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PostPosted: Wed Jul 27, 2011 9:45 am 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
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Location: New Forest, UK
My pals seem to have had nothing but trouble with external BBs on road bikes. I shudder to imagine the lifetime on MTBs with all that mud.

Cartridge BBs are OK and I have a couple of UN72 which have lasted over 20,000 miles. However, to get it all to fit in a cartridge the bearings are smaller than a cup and cone, which has 11x 1/4" balls. That's fine on a solo bike, but tandems have much higher bearing loadings and cartridge BBs only last a couple of thousand, whereas the cup and cone ones last longer in terms of bearing wear.


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PostPosted: Wed Jul 27, 2011 11:19 am 
Gold Trader / PoTM Winner / RB Rider
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Lysander wrote:
God help us when he discovers his balls............Image


:lol:


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PostPosted: Wed Jul 27, 2011 12:59 pm 
Retro Guru
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lewis1641 wrote:
Lysander wrote:
God help us when he discovers his balls............Image


:lol:


Can you imagine the thread title, wording and pictures ... :shock: :lol:

WD :D


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PostPosted: Wed Jul 27, 2011 3:13 pm 
Retrobike's #1 Comedy Genius
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Heh.......bizarrely, I find myself warming to the chap........ :P


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PostPosted: Wed Jul 27, 2011 3:18 pm 
retrobike rider
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hamster wrote:
My pals seem to have had nothing but trouble with external BBs on road bikes. I shudder to imagine the lifetime on MTBs with all that mud.

Cartridge BBs are OK and I have a couple of UN72 which have lasted over 20,000 miles. However, to get it all to fit in a cartridge the bearings are smaller than a cup and cone, which has 11x 1/4" balls. That's fine on a solo bike, but tandems have much higher bearing loadings and cartridge BBs only last a couple of thousand, whereas the cup and cone ones last longer in terms of bearing wear.

That's why they turned to external again

Moving to ISIS/Hollowtech(Octalink) made the cartridge system strain even further as the shaft got thicker balls shrank.

So they moved them outside to use bigger balls or made them fit in the frame itself (BBxx stuff, way to modern for me to bother to know it's name)

I must say though, I'm disappointed as my original UN90 has started to get some play, still very smooth running though.


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PostPosted: Wed Jul 27, 2011 3:32 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
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Location: New Forest, UK
BB30 was also another approach, with the advantage of the bearing shells getting some support from the frame, unlike external. However, I've heard a couple of disappointing stories about BB30 too. It amazes me, surely such a bearing would be well-understood by now and after a century people would be able to make a durable one? :?


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PostPosted: Wed Jul 27, 2011 3:42 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
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Location: New Forest, UK
Aren't pedals brilliant!


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PostPosted: Wed Jul 27, 2011 3:59 pm 
Retrobike's #1 Comedy Genius
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:P


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PostPosted: Wed Jul 27, 2011 4:39 pm 
retrobike rider
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hamster wrote:
BB30 was also another approach, with the advantage of the bearing shells getting some support from the frame, unlike external. However, I've heard a couple of disappointing stories about BB30 too. It amazes me, surely such a bearing would be well-understood by now and after a century people would be able to make a durable one? :?


I'm guessing they could just increase the shell size? (them adjustable single speed ones for example. Though knock on effects with taking up more room behind the frame, unless you shape them.

The problem I see with HT-II and if BB30 takes the same approach, is the same problem with cartridge bearings in hubs etc and they can so easily be overtightened to displace the two races in the cartridge. At least with cup'n'cone old 'rubbish' setting it was easy and it didn't damage everything so much.

I guess bearing style type and some cartridges may be made to have a similar behaviour to cup'n'cone side loading.

One for me not to worry about though.


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