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Euro BB is a euro BB is a euro BB--or is it?



 
 
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  #1  
Old July 21st 05, 01:30 AM
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Default Euro BB is a euro BB is a euro BB--or is it?

Bike: Thorn Raven Tour with eccentric BB shell.
Problem: Drive-side bottom bracket race will not thread into eccentric
shell.

I thought that all Euro BB threads are the same and that I could use
any brand on the market. I'm thinking not since I've tried two
different bottom brackets ( an IRD sealed cartridge and Primo Powerbite
euro ) without good results.
I stopped by the local bike shop today to see what they thought. They
pulled a Shimano sealed cartridge BB off the shelf and it threaded in
without difficulty? Now I'm confused. Is the Thorn eccentric
eccentric BB only capable of using a Shimano sealed cartridges?

Thanks and best regards,

David

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  #3  
Old July 21st 05, 02:38 AM
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Default Euro BB is a euro BB is a euro BB--or is it?

Yes, I do realize that the right-hand side cup is left-hand threaded.
Even armed with this knowledge the BB bracket still will not thread
into place.

David

  #6  
Old July 21st 05, 03:23 AM
Chalo
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Default Euro BB is a euro BB is a euro BB--or is it?



I wrote:

Consider that while "Euro" usually refers to ISO/British standard
threading, there are several other European BB thread standards about
the same overall size.


I see now that you mention the Primo Powerbite Euro BB. That is made
in only one thread standard, ISO. So it sounds like you may have
bruised threads, burs, or some other similar problem with the bearing
cups on your Primo BB. If you have a 24tpi thread file or any small
jeweler's files available, you can try to touch up the leading edge of
the threads on the bearing cups, but otherwise you should probably
pursue the matter with the merchant.

Chalo

  #8  
Old July 21st 05, 04:05 AM
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Default Euro BB is a euro BB is a euro BB--or is it?

Thanks Jeff for the info---

I forgot to mention that I'm able to get the drive-side started
threaded in a few turns before it just stops and does not go any
further. Perhaps I could take the eccentric shell in to the shop and
have the threads chased? Also, the other side of the shell threads
just fine. This leaves me thinking the threads are buggered-up some on
the drive-side.

 




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