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PostPosted: Tue Jul 16, 2013 6:50 pm 
Devout Dirtbag

Joined: Thu Aug 26, 2010 6:46 am
Posts: 100
Location: victoria, british columbia
is there a simple way to determine if a bb will work for a 68mm or 73mm.

i'm wondering if this will fit my 68mm bottom on my brodie expresso:

http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 1243227019

should i just avoid 68/73mm bb's for my bike?

thanks in advance.


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PostPosted: Tue Jul 16, 2013 6:56 pm 
Old School Hero

Joined: Sun Apr 28, 2013 8:56 pm
Posts: 209
Location: Flipping between Wigan and Lincoln
A 73mm will go in a 68mm shell but it'll hang over on the non-drive side quite a bit (by an extra 5mm), not a massive problem just looks naff and can cause issues with sensitive knees.


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PostPosted: Tue Jul 16, 2013 7:00 pm 
Devout Dirtbag

Joined: Thu Aug 26, 2010 6:46 am
Posts: 100
Location: victoria, british columbia
thanks elysarian, that's what I needed to know.

a quick measurement and addition of the 5mm to the non-drive side on my bike puts it damn close to the crank arm. i'll stick with looking for a 68mm.


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PostPosted: Tue Jul 16, 2013 9:22 pm 
retrobike rider
retrobike rider
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Joined: Fri Aug 08, 2008 2:36 pm
Posts: 16750
Location: Yorkshire, England
That would have worked fine in 68 or 73.
68 just means you need to centre it properly. Thought they had lockrings on them as well.
With other 73's on 68 like shimano you just put a 2.5mm spacer on the drive side between the stop-lip and frame


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PostPosted: Tue Jul 16, 2013 11:58 pm 
Retro Guru

Joined: Fri Jun 14, 2013 12:02 am
Posts: 683
Location: Canada
All syncros BBs were the same and could fit 73 or 68. The one in the ebay ad in the OP is missing the lockrings, there should be one on each side. This was actually a great feature which means you could adjust your chainline slightly in 68mm shells.


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PostPosted: Wed Jul 17, 2013 1:07 am 
Devout Dirtbag

Joined: Thu Aug 26, 2010 6:46 am
Posts: 100
Location: victoria, british columbia
ah, ok... i'm learning much here. that makes total sense to me that bb's without lips on the cups can be used either way. and that they need lockrings. bb's with lips on the cups need spacers if they are going in something smaller.

thanks again.


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PostPosted: Wed Jul 17, 2013 7:29 am 
Retro Guru

Joined: Fri Jun 14, 2013 12:02 am
Posts: 683
Location: Canada
rocketboy2000 wrote:
ah, ok... i'm learning much here. that makes total sense to me that bb's without lips on the cups can be used either way. and that they need lockrings. bb's with lips on the cups need spacers if they are going in something smaller.

thanks again.


There were later versions that may not have had lock rings, but I think the one in the auction is a lock ring model.


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