Italian - English thread compatability question
03-05-10, 10:13 PM
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Italian - English thread compatability question
I'm looking at a 70/80's vintage Italian Columbus tube frame. All the parts I have to build it up are English thread Campy SR. I've read that English and Italian threads are close enough to use, but not so much w Campy. Should I punt on the Italian frame? It's not a good enough frame to go to the trouble to replace all the components I have, but would be a good buy and nice ride. Thanks.
03-05-10, 10:34 PM
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Italian thread what? Headset or bottom bracket?
The headset may just pass. On the other hand, the English bottom bracket cups will simply fall through the Italian BB.
That said, it is generally not a good idea to mix-and-match threads on anything.
-Kurt
The headset may just pass. On the other hand, the English bottom bracket cups will simply fall through the Italian BB.
That said, it is generally not a good idea to mix-and-match threads on anything.
-Kurt
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03-05-10, 11:22 PM
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Italian and English *headsets* are close enough to be interchangeable, but Italian and English bottom brackets are not.
03-06-10, 04:46 AM
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That said, it is generally not a good idea to mix-and-match threads on anything.
-Kurt
-Kurt
03-06-10, 06:40 AM
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If I were confronted with mismatched BB threads on a bike I really wanted , I would consider this $60 solution from Velo Orange:
03-06-10, 02:07 PM
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It depends more on the manufacturer of the dropout than the country. Campy is 10mm x 26 TPI, but Suntour, Shimano, Huret and Zeus are 10mm x 1.0mm (25.4 TPI). Campy is considered Italian and all the rest are considered French. There is no English, per se.
03-06-10, 05:01 PM
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so does this mean if you want to install a shimano RD on a bike with campy dropouts, you need to swap out the shimano bolt for an italian one?
03-06-10, 10:43 PM
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The derailleurs work in each other's derailleur hangers because there is not enough thread engaged for the 26 TPI to start binding against the 25.4. In hubs, you can thread a Shimano locknut (only 3 threads deep) onto a Campy axle no problem, but a Shimano cone will not work -- the mismatch eventually causes the cone to bind before it threads fully on.
(Back after a long period where I couldn't log in; the mods allowed me to use this new name.)
(Back after a long period where I couldn't log in; the mods allowed me to use this new name.)
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