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  1. #1
    Oldie Again's Avatar
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    Clamp-on to carbon frame?

    I am expecting a CF set without braze-on for the FD. Is it OK to use a clamp on the seat tube? Are there any carbon frames around that use clamps successfully for that?

  2. #2
    Senior Member mechBgon's Avatar
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    Yes, that's normal. Think about it, if there's no braze-on style tab, what other option is there?

  3. #3
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    Take it you mean a clamp on FD, then you can, the one here has a SRAM Rival band on spec'd http://www.planet-x-bikes.co.uk/i/q/...ival-road-bike

    You can get braze on adaptors, I have one of these on my carbon bike, I prefer this to the band on FD with carbon, and it works fine with it. here's an example from Campagnolo http://www.jensonusa.com/store/produ...p+Adapter.aspx other cheaper ones are available.

    Would look at what the build up version of you frame has / any manufacture recomendations and go with them.

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    A decent carbon frame will be reinforced slightly (or not need it) where the maker expects you to clamp on a front derailleur. But be aware that it's possible to damage the tube by over tightening or with a badly formed rigid clamp body.

    Fit the FD around the tube and close the clamp with your fingers. It should fit right and close finger tight without digging in anyplace. Some may need a bit of flex for the curves to match, but if it needs more that a light touch, the clamp will distort the tube when tightened and crack it. Also check mfr. torque specs, or if none are available tighten only as tight as needed for the FD to do it's job. I paint a bit of traction compound inside the clamp to increase friction and lower the needed clamping force.
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  5. #5
    Oldie Again's Avatar
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    Great, guys - that eases my mind. Good to see there are lots of clamp-on FD on the market as well.
    I have a set of Ultegra brifters I intend to use for the build.
    On the other hand I want to use a Sugino triple I bought recently (165mm!).
    I want to be sure to eliminate any problems with step synchronization.
    Is the Sugino compatible with Shimano?

  6. #6
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    Quote Originally Posted by Again View Post
    On the other hand I want to use a Sugino triple I bought recently (165mm!).
    The cranks are OK, but be sure to use a triple FD and triple left lever. I'm not as familiar with Ultegra levers as others are, so they may all be triple compatible, but it's something to confirm.
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  7. #7
    pmt
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    Quote Originally Posted by FBinNY View Post
    I paint a bit of traction compound inside the clamp to increase friction and lower the needed clamping force.
    +1, me too!

    Oh bollocks, I just did a "me too" post.

  8. #8
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    Quote Originally Posted by pmt View Post
    ...

    Oh bollocks, I just did a "me too" post.
    Your first?
    FB
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    An ounce of diagnosis is worth a pound of cure.

    “Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

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    WARNING, I'm from New York. Thin skinned people should maintain safe distance.

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