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PostPosted: Sun Feb 24, 2013 8:38 pm 
Old School Hero

Joined: Thu Feb 10, 2011 1:55 pm
Posts: 239
Does anyone know which BB length I need for this, I know it's a 68mm shell but am unsure of the correct spindle length.

Thanks


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PostPosted: Sun Feb 24, 2013 8:55 pm 
retrobike rider / Gold Trader
retrobike rider / Gold Trader

Joined: Sat Jul 21, 2007 9:48 am
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Location: Bristle
Axle length depends on the cranks. next time


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PostPosted: Mon Feb 25, 2013 4:47 pm 
Old School Hero

Joined: Wed Apr 25, 2012 10:02 am
Posts: 212
Location: Devon
Not a fan of unhelpful answers,just been through this one myself.Mine came with MT60 Deore Crankset and 122mm bottom bracket,but I changed to a sugino chainset because I don't like egg shaped rings.The sugino required a 113mm bottom bracket in order for the front mech to work and the chainline to be correct.Cheers


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PostPosted: Mon Feb 25, 2013 5:08 pm 
Old School Hero

Joined: Thu Feb 10, 2011 1:55 pm
Posts: 239
Thanks, I think I need 113mm too, found some more info here http://sheldonbrown.com/bbsize.html


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PostPosted: Mon Feb 25, 2013 7:38 pm 
retrobike rider
retrobike rider
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Joined: Fri Aug 08, 2008 2:36 pm
Posts: 16747
Location: Yorkshire, England
To be fair to cce, that is the correct answer with nothing more to go on.
Basically asking what crank it is.

107 to 127mm is the normal variation, with few outside of that. or 107-113 or 113 to 118 or 118 to 122 or 122 to 127... depending on the crank on question.....


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PostPosted: Mon Feb 25, 2013 9:28 pm 
Retro Guru
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Joined: Sun Sep 30, 2012 9:02 pm
Posts: 1180
Location: In the Garage in Somerset
I have middleburn RS3's with a 113mm axle on mine, I think Shimano M737 XT's would also have been 113mm (this is from memory) Really depends on the cranks as CCE says.

Which cranks are you planning on using?


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PostPosted: Mon Feb 25, 2013 9:51 pm 
retrobike rider
retrobike rider

Joined: Tue Jul 10, 2012 11:58 pm
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Location: Bournemouth
I've got M737s on 3 bikes (DBs), and I think they are all 110mm length


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PostPosted: Mon Feb 25, 2013 9:55 pm 
Old School Hero

Joined: Thu Feb 10, 2011 1:55 pm
Posts: 239
I'm using new shimano alivio 8 speed cranks, Looking at sheldon's page, it seems I can use 110-113.


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PostPosted: Mon Feb 25, 2013 10:14 pm 
retrobike rider
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Location: Yorkshire, England
stevenk4563 wrote:
I'm using new shimano alivio 8 speed cranks, Looking at sheldon's page, it seems I can use 110-113.



M430 / M431 ? Check the product number on the bac
All the techdocs and info are on shimano site for them. You should have the installation instructions with them as well.
If it's the square taper version then they say to use 113 length as it's designed to have a chainline of 50mm (being modern)

Although M431 say LL123 which could either be a typo of LL113 or they now give a 122.5 the coding LL123 and you need a 122.5/123 bottom bracket. But then the older version also has this same numbering.


I dare say (but do not know), you could fit a 107/110 in there and move to the more retro 47.5 chainline (if you've not fitted a modern front mech with it's shims that is) for the M430

http://techdocs.shimano.com/techdocs/bl ... ID=jNpbGrM (The SI-xxxx links)


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PostPosted: Mon Feb 25, 2013 10:34 pm 
Old School Hero

Joined: Thu Feb 10, 2011 1:55 pm
Posts: 239
Now I'm really confused :( this is the chainset I've got

http://www.chainreactioncycles.com/Mode ... elID=46025


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