Threading question
04-01-11 | 08:59 PM
#1
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Threading question
I just bought a Raleigh Super Course from a French gentleman who owns nothing but Italian tools. He indicated the bottom bracket has been retapped.
I have tried Raleigh cups, Italian cups, and French cups to no avail. What should I do?
-Lord Helmetz
I have tried Raleigh cups, Italian cups, and French cups to no avail. What should I do?
-Lord Helmetz
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04-01-11 | 09:03 PM
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04-01-11 | 09:11 PM
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04-01-11 | 09:13 PM
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04-01-11 | 09:14 PM
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04-01-11 | 09:15 PM
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04-02-11 | 07:23 AM
#11
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I think this is a final April Fools gag. on the chance it is not, did you try Swiss? you need one of those self threading VO BBs
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04-02-11 | 08:23 AM
#14
An Italian shell diameter is greater than English. Is it even possible to tap an English thread shell to Italian, or would the threads cut too deep?
EDIT: 1.2 mm difference...so it would shave off a good deal of the BB shell, but I'd imagine shells were made thick enough for different threading standards?
EDIT: 1.2 mm difference...so it would shave off a good deal of the BB shell, but I'd imagine shells were made thick enough for different threading standards?
Last edited by JunkYardBike; 04-02-11 at 08:28 AM.
04-02-11 | 08:25 AM
#15
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k_as_in_knife got the joke. I was playing on word association. "English" makes people think of Raleigh; yet, as most of us know, Raleigh threading is proprietary 26 TPI, while standard English threading is 24 TPI.
The correct answer is "English" - the most common BB threading to begin with
-Kurt
The correct answer is "English" - the most common BB threading to begin with
-Kurt
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04-02-11 | 10:07 AM
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04-02-11 | 11:37 AM
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Last edited by JohnDThompson; 04-02-11 at 11:42 AM.
04-02-11 | 11:43 AM
#19
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P.S.: In theory, the mythical French gentleman would have tapped the bottom bracket out to 24 TPI threads over the English 26 TPI, which was used in a number of Super Courses. Although that would technically result in compatibility with both thread types, the 24 TPI threads might have been damaged enough (or enough grit may have accumulated in them) to jam a pair of 26 TPI cups.
-Kurt
-Kurt
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04-02-11 | 03:15 PM
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All of this could have been avoided if one used a Left handed metric adjustable allen wrench. Works for me everytime.
