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Is it possible to convert a short cage derailleur (for example the huret svelto) to a long cage derailleur by just taking the lower cage and replacing it by a longer one?

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Of course, you can do it, if you have the long cage and any associated parts. But about the only way to get a long cage is to take it off another derailer. And note that, to be "perfect", springs may need to be swapped as well, and the stops may be cut differently on the upper cage (or other differences) depending on whether it's for long or short cage. – Daniel R Hicks May 29 '12 at 15:08

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Yes, if the derailleurs are the same model, and you can get all the parts, (which isn't usually a straightforward process) youcan convert from short cage to long cage.

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