"Brinnelled" BB spindle - needs replacing?

[FreeWheel]

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.

 

[cce]

That spindle is dead.

 

[FreeWheel]

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

 

[Midlife]

Is that modern shimano one a JIS size?

Shaun

 

[FreeWheel]

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.

 

[cce]

spindle length is crank dependent. So don't buy a BB until you know what cranks you'll be using

 

[FreeWheel]

OK, thanks for the advice.

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

Thanks.

 

[cce]

they don't really.

 

[Old Ned]

they don't really.

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