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PostPosted: Tue Jul 23, 2013 4:51 pm 
Dirt Disciple

Joined: Mon Jul 08, 2013 11:02 am
Posts: 13
Hi,

I'm rebuilding an old Dawes Ambassador as a summer project. I took apart the bottom bracket today and degreased the innards. It's pretty mucky but seems OK, except for some damage to the spindle. It's pitted at one end at the point the bearings contact (is that called the cone?) for about 45° of the circumference.

Picture below. Upper picture is undamaged side, lower picture shows the damage between the two red arrows.

My question is - is this a dead spindle? It seems like it won't run very smoothly even if repacked with new bearings so should I just get a new one?

Cheers.


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PostPosted: Tue Jul 23, 2013 4:55 pm 
retrobike rider / Gold Trader
retrobike rider / Gold Trader

Joined: Sat Jul 21, 2007 9:48 am
Posts: 6979
Location: Bristle
That spindle is dead.


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PostPosted: Tue Jul 23, 2013 6:40 pm 
Dirt Disciple

Joined: Mon Jul 08, 2013 11:02 am
Posts: 13
Thought so. Thanks.

On a related note, can I easily upgrade to a sealed BB by chucking in a Shimano UN55? The specs seem to add up but is there anything I'm missing thinking about?

My cup-and-cone:

BB shell= 68mm
Spindle length = 118mm
English threading
Square tapered

UN55:

68x118mm English BSA

http://www.acycles.co.uk/shimano-un55-s ... roduit_cpc

Cheers


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PostPosted: Tue Jul 23, 2013 7:24 pm 
Old School Grand Master
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Joined: Fri Oct 14, 2011 8:41 pm
Posts: 8240
Location: Cumbria
Is that modern shimano one a JIS size?

Shaun


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PostPosted: Tue Jul 23, 2013 7:39 pm 
Dirt Disciple

Joined: Mon Jul 08, 2013 11:02 am
Posts: 13
Yes, but at the moment I have no cranks so it isn't really an issue - I'll just get JIS cranks when I buy some.


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PostPosted: Tue Jul 23, 2013 10:03 pm 
retrobike rider / Gold Trader
retrobike rider / Gold Trader

Joined: Sat Jul 21, 2007 9:48 am
Posts: 6979
Location: Bristle
spindle length is crank dependent. So don't buy a BB until you know what cranks you'll be using


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PostPosted: Tue Jul 23, 2013 10:23 pm 
Dirt Disciple

Joined: Mon Jul 08, 2013 11:02 am
Posts: 13
OK, thanks for the advice.

Sorry for more questions, but how much do the chainrings I choose affect spindle length?

Thanks.


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PostPosted: Tue Jul 23, 2013 11:15 pm 
retrobike rider / Gold Trader
retrobike rider / Gold Trader

Joined: Sat Jul 21, 2007 9:48 am
Posts: 6979
Location: Bristle
they don't really.


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PostPosted: Wed Jul 24, 2013 8:57 pm 
rider | rBoTM Winner
rider | rBoTM Winner
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Joined: Fri Jan 25, 2008 1:42 pm
Posts: 5132
Location: Wakefield, Yorkshire
cce wrote:
they don't really.

It's the cranks that dictate the spindle length. Different models may need different length spindles.


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