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Old 10-27-06, 04:11 PM   #1
DeafLamb
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French to English Tapping

About a month ago or more, i bought an old peugot frame to convert to a fixie. Worked great for a bit but the bottom bracket is gone. It's French Threaded.

A guy at the LBS where I bought the frame says he can retap it to English Threads. The owner of another LBS says it can't be done.

The frame isn't worth much to me now, at least not enough to invest in new French Threaded components. They're going to charge me 15 for the retap, so I'm going to let them give it a whirl. Was just wondering what the Guru's here thought?

-ray
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Old 10-27-06, 06:57 PM   #2
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Quote:
Originally Posted by DeafLamb
About a month ago or more, i bought an old peugot frame to convert to a fixie. Worked great for a bit but the bottom bracket is gone. It's French Threaded.

A guy at the LBS where I bought the frame says he can retap it to English Threads. The owner of another LBS says it can't be done.

The frame isn't worth much to me now, at least not enough to invest in new French Threaded components. They're going to charge me 15 for the retap, so I'm going to let them give it a whirl. Was just wondering what the Guru's here thought?

-ray
I have not tried this although I have been told it can be done because the threads are close enough. The problem is, French threading is right hand both sides, and only the adjustable cups are right hand thread on English bbs, so you would have to use 2 adjustable cups and lots of loctite I would think. Also, you would need to use a second right threaded tap as a pilot or a conical pilot. I don't think I would let them try re-threading it without a piloted tool.
You will also run into issues with spindle length (center section)if I remember correctly.
I have successfully re-threaded a Raleigh 26tpi bb to English, and that is a bigger difference than French to English.
Dan Burkhart
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Old 10-27-06, 08:03 PM   #3
Grand Bois
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I think that a YST universal bottom bracket would be a better way to go if you can find a shop that has the tool to chamfer the bottom bracket shell.

http://www.sheldonbrown.com/harris/b...ckets.html#yst

Last edited by Grand Bois; 10-28-06 at 09:56 AM.
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Old 10-28-06, 07:02 AM   #4
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Another possibility is to retap from French to Italian. Italian threads are larger in diameter so you can get clean new threads if the job is done right and they are right-hand threaded on both sides. The only problem is Italian bottom brackets are 70 mm wide instead of 68 mm so you may need a 1 mm spacer on each side.
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Old 10-28-06, 07:16 AM   #5
Noah Scape
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Originally Posted by Dirtdrop
I think that a YST universal bottom bracket would be a better way to go if you can find a shop that has the tool to chamfer the bottom bracket.

http://www.sheldonbrown.com/harris/b...ckets.html#yst

How long have these been on the market?!!!
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