Bottom bracket identification.
03-26-11 | 08:21 PM
#1
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From: Columbia, SC
Bottom bracket identification.
I was told by someone in in the bike mechanics section that some French bikes have a Swiss threaded bottom bracket cup which would mean the fixed cup is left-threaded. I read on Sheldon Brown's website that French and Italian bikes are both right-threaded. I am having trouble removing the fixed cup using the bolt and washer trick and want to make sure I am going the right way. Is there a way to identify whether or not the bottom bracket is Swiss or French threaded?
03-26-11 | 08:29 PM
#2
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From: Shady Pines Retirement Fort Wayne, In
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there are always exceptions to the rule. I have learned here, and I am not expert, Peugeot changed from French to Swiss for a short period before going to English.
I have Italin built Bianchis, and a Cornelo that English BBs the only way to know for sure is to check it.
I have Italin built Bianchis, and a Cornelo that English BBs the only way to know for sure is to check it.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk
03-26-11 | 08:36 PM
#3
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Everything on the bicycle is French-threaded. So if that is the case there would definitely not be a Swiss-threaded bottom bracket cup right, or is it possible for it to be Swiss-threaded by itself? When I first tried to remove the cup and it did not budge my first thought was that it must go the other way, but either way I am going to have to use a jack handle to remove this thing. I don't want to do that though if I am turning it the wrong way.
Last edited by :andrew; 03-26-11 at 08:45 PM.
03-26-11 | 08:51 PM
#5
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Swiss bottom bracket cups were used on Peugeots between 81 and 85 but not universally... are there any external stampings on the bottom bracket ?
If you have removed the non drive side cup and can look inside the shell you should be able to see how the internal threads are cut.
If you have removed the non drive side cup and can look inside the shell you should be able to see how the internal threads are cut.
03-26-11 | 09:01 PM
#6
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From: Columbia, SC
I know for a fact the bike is a 72. There are no stamps at all on the bottom bracket. I think what I am going to do is use a pick to try and follow the threads inside of the cup and see which way they go up. Once I find out which way it turns is it safe to use a breaker bar to break the cup loose. I really do not want to damage the frame.
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