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  1. #1
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    wrong front derailleur

    I accidentally bought the wrong front derailleur for a 2x7 to 2x10 conversion I am doing on my 1994 cannondale r400. I got the 105 fd 5700 with some other things I bought off of craigslist. However I got a top pull 34.9 and I need a bottom pull 31.8

    Will it work at all to use my old 2x7 derailleur while I wait for the other one to come or is it not going to work at all?

  2. #2
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    Actually I was wrong, they are both bottom pull. I might actually have a spacer that will let me use this derailleur with my smaller tube. However, if that doesnt work can I use the old rsx 2x7 with my 2x10 or will it not work at all?

    Thanks

  3. #3
    Senior Member Retro Grouch's Avatar
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    My philosophy:
    If I'm buying parts I'll hold out for the correct matching thing.
    If I already own parts I'll bolt up what I have and see if I can make it work.

    You're in the second category. I'm about 90% confident that your existing derailleur will work. If you're using bar end shifters or some other friction thing I'd bump that up to about 98%.

  4. #4
    Insane Bicycle Mechanic Jeff Wills's Avatar
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    Quote Originally Posted by Retro Grouch View Post
    My philosophy:
    If I'm buying parts I'll hold out for the correct matching thing.
    If I already own parts I'll bolt up what I have and see if I can make it work.

    You're in the second category. I'm about 90% confident that your existing derailleur will work. If you're using bar end shifters or some other friction thing I'd bump that up to about 98%.
    +1. If you want to try the 10-speed front derailleur, use a short piece of PVC pipe to make a shim. I did this when I bought the wrong size clamp (like you did) and it worked fine for years.
    Jeff Wills

    All my bikes.

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