BB question

[HOU5EY]

Hi, please can somebody tell me what the UN number means when buying a bottom bracket? I'm guessing it has something to do with the amount of bearings? I know I need a 113mm x 68mm but se it's available in BB-UN54 or BB-UN26.

 

[uclown2002]

Can't help on the UN bit but BB-UN55 is better quality than 54 and not much difference in price.

The UN26 is the basic model.

 

[Racing roadkill]

The UN number is just part of the type designation.

http://sheldonbrown.com/bbsize.html

Knock yourself out.

 

[HOU5EY]

Cool thanks for that, looks like the higher UN is better quality

 

[compo]

The UN55 is better than the UN26. Another advantage is that it has a metal fixing ring rather than the plastic one as on the 26.

 

[midlife]

I think UN55 bottom brackets are on special offer somewhere for £9.99.

Shasun

 

[ColinJ]

I think UN55 bottom brackets are on special offer somewhere for £9.99.

Shasun

£11.99 at Chain Reaction Cycles. You can get them cheaper elsewhere but then with postage the cost would probably be higher.

 

[Pale Rider]

Hi, please can somebody tell me what the UN number means when buying a bottom bracket? I'm guessing it has something to do with the amount of bearings? I know I need a 113mm x 68mm but se it's available in BB-UN54 or BB-UN26.

The UN refers to the thread type.

Both the brackets - and most others - are the same thread, so it's not relevant to your buying decision but does answer your question.

(Too much) info here: http://en.wikipedia.org/wiki/Unified_Thread_Standard