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 Post subject: Quick BB question
PostPosted: Thu Jun 13, 2013 3:05 pm 
Devout Dirtbag

Joined: Tue Apr 24, 2012 1:38 pm
Posts: 128
Location: Dewsbury. A blight on our fair land.
Hey all.

I've got a 94 Kilauea with standard(worn)un51 bb. Its a 68mm x 110mm, with a Standard Sugino Impel crank. I'd like to know if its possible to fit a slightly different length bb? Just a mil or two either longer or shorter. Will it have a huge impact on gearchange/chainsuck/wear etc?
I've been seeing a lot of 107mm and 113mm bb's. There are 110mms out there, but I was wanting to upgrade to a un90/91.
I frame/forks are currently at Bob Jacksons for a respray so I can't check to see how much distance I have between crank rings and chainstay, etc.

Thanks for any info. ;)


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 Post subject: Re: Quick BB question
PostPosted: Thu Jun 13, 2013 3:54 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 8219
Location: New Forest, UK
Apart from the obvious one of the chain rings hitting the frame, if you fit one too short you might find that the chain scrapes the outer ring when on the top sprocket and middle ring.

Frankly, you will probably get away with 3mm each way. I'd change up to a UN72 which has the hollow axle and so most of the weight saving of a UN91.


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 Post subject: Re: Quick BB question
PostPosted: Thu Jun 13, 2013 4:36 pm 
Devout Dirtbag

Joined: Tue Apr 24, 2012 1:38 pm
Posts: 128
Location: Dewsbury. A blight on our fair land.
Smashing!
Thank you very much for the info.


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 Post subject: Re: Quick BB question
PostPosted: Thu Jun 13, 2013 8:22 pm 
retrobike rider
retrobike rider
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Joined: Wed Mar 03, 2010 11:59 am
Posts: 4437
Location: Near Southampton
Yeah I think you would get away with a 3 mm difference...I'd go larger rather than smaller tho...


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 Post subject: Re: Quick BB question
PostPosted: Thu Jun 13, 2013 8:37 pm 
retrobike rider
retrobike rider
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Joined: Fri Aug 08, 2008 2:36 pm
Posts: 16748
Location: Yorkshire, England
107 will bring the non-drive side crank in ~3 mm towards the frame.

113 will place the drive side ~3mm further from the frame.

That is assuming you stick to Shimano bottom brackets.


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 Post subject: Re: Quick BB question
PostPosted: Thu Jun 13, 2013 8:40 pm 
Gold Trader / PoTM Winner / RB Rider
Gold Trader / PoTM Winner / RB Rider
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Joined: Tue Feb 26, 2013 6:26 pm
Posts: 16941
Location: 54 Festive Road Winchcombe GLOUCS Yarp...
Don't want to hijack the thread but how do I know what size BB I would need for my MF R&R?


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 Post subject: Re: Quick BB question
PostPosted: Thu Jun 13, 2013 8:42 pm 
retrobike rider
retrobike rider
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Joined: Wed Mar 03, 2010 11:59 am
Posts: 4437
Location: Near Southampton
The History Man wrote:
Don't want to hijack the thread but how do I know what size BB I would need for my MF R&R?


Depends on what crankset you are running...


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 Post subject: Re: Quick BB question
PostPosted: Thu Jun 13, 2013 8:48 pm 
Gold Trader / PoTM Winner / RB Rider
Gold Trader / PoTM Winner / RB Rider
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Joined: Tue Feb 26, 2013 6:26 pm
Posts: 16941
Location: 54 Festive Road Winchcombe GLOUCS Yarp...
A sugino that's started clicking! What do I need to know? Last one I stripped had cotter pins.....old school.


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 Post subject: Re: Quick BB question
PostPosted: Thu Jun 13, 2013 9:11 pm 
retrobike rider
retrobike rider
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Joined: Wed Mar 03, 2010 11:59 am
Posts: 4437
Location: Near Southampton
The History Man wrote:
A sugino that's started clicking! What do I need to know? Last one I stripped had cotter pins.....old school.


Try Sheldon Brown....google him he is the bike guru!...Personally I have replaced all the BB's on my bikes for sealed ones...un54 or 55


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 Post subject: Re: Quick BB question
PostPosted: Thu Jun 13, 2013 9:19 pm 
Gold Trader / PoTM Winner / RB Rider
Gold Trader / PoTM Winner / RB Rider
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Joined: Tue Feb 26, 2013 6:26 pm
Posts: 16941
Location: 54 Festive Road Winchcombe GLOUCS Yarp...
Thanks fellow Marin lover.


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