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  1. #1
    Senior Member Sincitycycler's Avatar
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    Clamp-on Front D hanger on a carbon frame?

    I use a cyclocross crankset on my Scott and it currently has a braze on mount.

    Is it taboo to put a clamp-on front derailleur hanger on a carbon bike?

    I just can't get the front d as low as I like right now...
    "How did all those 'Keep Off the Grass' signs get there?"

  2. #2
    Elitist Troglodyte DMF's Avatar
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    You currently have a braze-on mount on a carbon tube? That's pretty interesting.
    Stupidity got us into this mess - why can't it get us out?

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  3. #3
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    I would guess that its not actually brazed on. The "braze-on" mount on my Giant TCR frame is a piece of plastic that's screwed into the carbon fiber frame.

  4. #4
    30 YR Wrench BikeWise1's Avatar
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    Quote Originally Posted by Sincitycycler
    I use a cyclocross crankset on my Scott and it currently has a braze on mount.

    Is it taboo to put a clamp-on front derailleur hanger on a carbon bike?

    I just can't get the front d as low as I like right now...
    Why not ask Scott?

    There's a reason they go to all the trouble to put a tab on. I'd bet if the frame was built to take a clamp, it would've been sold that way....

  5. #5
    Senior Member Sincitycycler's Avatar
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    Quote Originally Posted by Phoible
    I would guess that its not actually brazed on. The "braze-on" mount on my Giant TCR frame is a piece of plastic that's screwed into the carbon fiber frame.
    Well, my tab is screwed on too but it looks like there is some dried epoxy that oozed out from under it.

    Do any carbon bikes use a clamp on?
    "How did all those 'Keep Off the Grass' signs get there?"

  6. #6
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    There is probably no reason why it wouldn't work. However, you could void your warranty if your frame cracks.

    I think that Look's Carbon frames use clamp-on derailleurs.

  7. #7
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    Quote Originally Posted by Sincitycycler
    Well, my tab is screwed on too but it looks like there is some dried epoxy that oozed out from under it.

    Do any carbon bikes use a clamp on?
    My old Specialized Epic Carbon (was sold under Allez name in US, I think) had a clamp-on. Main reason most carbon bikes use screw/glue/rivet-on holder (of braze-on style) is that it allows for non-standard tube diameter + cross-section shape. You can't sell carbon bikes without funky tube shapes.

    Indeed some Look frames (555, 585 among others) are designed for clamp-on. Those that have shaped tubes (595, 486) have braze-ons.
    Last edited by Zouf; 01-04-07 at 08:08 AM.

  8. #8
    Got Hills, I do! "Fred"'s Avatar
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    I just purchased a new look frame and it is a clamp on type. It wasn't a cheap frame, and I think look knows what they are doing.
    Hope this helps!

  9. #9
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    I've never seen a CF bike with a clamp-on. I've assumed that it is not a good idea. Dunno

  10. #10
    ride, paint, ride simplify's Avatar
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    Didn't DrPete just have a major issue recently, with a clamp-on FD on his Pinarello F4:13? I think it cracked the clearcoat, but the verdict was that the frame was okay. Might do a search for that thread, it was within the last month or so, in Road Cycling, I think.
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