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PostPosted: Fri Feb 15, 2013 2:54 am 
Old School Grand Master
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Joined: Sat Oct 06, 2012 5:17 pm
Posts: 3775
Location: Norn Iron
Good morning all,

Is there an easy way or any way to check what type of BB a frame has? Obviously without the benefit of having a BB installed.

I recently made a boob with a French freewheel which threaded onto a hub (which was Italian or English) quite easily - removal was anything but easy and i am still crying about it; therefore i would not like to make the same mistake with a BB.

Thanks all,

Richard


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PostPosted: Fri Feb 15, 2013 9:39 am 
Gold Trader
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Joined: Mon Jan 15, 2007 11:40 am
Posts: 2999
Richard, if you measure the shell width then it should be either 68 or 70mm. 68 will more than likely be english threaded, 70mm will be italian. French (rare) and swiss (even rarer) are also 68mm, but unless it's a french bike or a very obscure make a 68mm BB is 99% certain to be english threaded.

You can also try running a fingernail round the threads in the driveside to determine which way they go - if the threading is reversed then it's an english BB, if not it's italian.

Even when you think you've determined which type you have, take it easy threading in a new BB, just in case!


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PostPosted: Fri Feb 15, 2013 10:20 am 
Retro Guru
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Joined: Mon Mar 26, 2012 5:21 pm
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"Everything You Wanted To Know About Bottom Brackets, But Were Afraid To Ask."

The third table from the bottom of the page is a table detailing the different threading and shell sizes.

The table below that explains the hilarious consequences of fitting the wrong BB to a given shell: fun for all the family!


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PostPosted: Fri Feb 15, 2013 11:30 am 
Old School Grand Master
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Joined: Sat Oct 06, 2012 5:17 pm
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Location: Norn Iron
Thanks chaps, at last - something which is not too complicated!!! I will tread carefully though.


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PostPosted: Fri Feb 15, 2013 5:41 pm 
Old School Grand Master
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Joined: Fri Oct 14, 2011 8:41 pm
Posts: 8226
Location: Cumbria
The tip with the fingernail is a good one to work out if it's right or left hand thread. Other way is to knock a pin into a small strip of wood and use instead of a fingernail :)

Shaun


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PostPosted: Sun Feb 17, 2013 1:43 pm 
Dirt Disciple

Joined: Sun Feb 12, 2012 1:55 pm
Posts: 93
Location: Blue Ridge mountains
I have a CBT Italia made in Italy with German Oria tubing and uses a French threaded bottom bracket. I later found that CBT was located near the French boarder and the bikes they made for the French market were French threading. I try to avoid French frames now as the parts are much harder to find.


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PostPosted: Sun Feb 17, 2013 3:11 pm 
Old School Grand Master
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Joined: Sat Oct 06, 2012 5:17 pm
Posts: 3775
Location: Norn Iron
A truly international frame!!


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PostPosted: Fri Feb 22, 2013 12:38 pm 
Old School Grand Master
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Joined: Wed Jul 25, 2007 2:04 pm
Posts: 3363
Location: Completely in the dark, thanks to me good mate Terry....
ScillySuffolk wrote:
"Everything You Wanted To Know About Bottom Brackets, But Were Afraid To Ask."

The third table from the bottom of the page is a table detailing the different threading and shell sizes.

The table below that explains the hilarious consequences of fitting the wrong BB to a given shell: fun for all the family!


So, based on Sheldon's page - take spare BSC cup without shoulder, drop into BB shell, if it falls right though it's more than likely to be an Italian shell*. Sounds an easy-peasy way of IDing Italian threading.

David

*"Oh, and one other thing - in this country they thread their fixed BB cups the wrong way round." </Charlie Croker> ;)


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