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Old 10-28-10, 04:55 PM   #1
sageo3000
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BB threading

I currently have a 68mm traditional 3 piece cup and cone bottom bracket.
if the cups tighten like british/iso (left side tightens right, right side tightens left) style bottom brackets, does it necessarily mean that the thread sizing is that of a british/iso style bottom bracket (1.370" X 24 tpi)?
then if this is true, upgrading to a sealed bb should work? and if it doesn't i'm screwed?
I could pull out the cups and measure the threads, but i spent a good part of today fitting/hammering/smashing/grinding the cotters all nice like to fit. I don't want to do it again.
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Old 10-28-10, 06:01 PM   #2
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yes a sealed bb will work for you.
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Old 10-28-10, 06:36 PM   #3
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Brit standard, used by Japan and exporting Asian manufacturers . too.


I went Ah Ha! when I found Cotter Presses to do those jobs,
on old cottered cranks.
pushed rather than beat them out, so they get reused.
the job got civil ..

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Old 10-28-10, 06:59 PM   #4
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+1
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Old 10-28-10, 08:23 PM   #5
Jeff Wills
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Quote:
Originally Posted by sageo3000 View Post
I currently have a 68mm traditional 3 piece cup and cone bottom bracket.
if the cups tighten like british/iso (left side tightens right, right side tightens left) style bottom brackets, does it necessarily mean that the thread sizing is that of a british/iso style bottom bracket (1.370" X 24 tpi)?
No. Especially if the bike is old enough to have cotters. If it's a Raleigh, you could have 1 3/8" X 26 tpi threading, in which case the only sealed BB that fits is a Phil Wood. (See http://www.sheldonbrown.com/cribshee...mbrackets.html ) If the bike's Japanese, it's almost certainly English threading.
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Old 10-28-10, 09:50 PM   #6
sageo3000
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it's not a raleigh. but people have aged my bike to about the 60's.
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Old 10-28-10, 10:23 PM   #7
Jeff Wills
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it's not a raleigh. but people have aged my bike to about the 60's.
Is the brand marked anywhere? If it's not a Raleigh, there's a 99% chance it's English thread, but I ran into a couple weird ones back when I was working in a shop.
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Old 10-28-10, 10:28 PM   #8
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Quote:
Originally Posted by sageo3000 View Post
I currently have a 68mm traditional 3 piece cup and cone bottom bracket.
if the cups tighten like british/iso (left side tightens right, right side tightens left) style bottom brackets, does it necessarily mean that the thread sizing is that of a british/iso style bottom bracket (1.370" X 24 tpi)?
Not necessarily. For example, Swiss-threaded bikes also have left-hand threading on the fixed cup, but the diameter and pitch are the same as French. A bike shop once almost destroyed the frame of our tandem by making the wrong guess about French vs. Swiss threading.

What make is the bike?
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Old 10-29-10, 02:10 AM   #9
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heres the head badge. i'm thinking it was made by some department store in the 60s/70s.


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