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  1. #1
    Junior Member KO3AK's Avatar
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    I need help picking a front derailleur

    Hello,
    Don't laugh at me because I am still a bicycle noob, but I need help selecting a proper front derailleur. I was transferring components to a different frame and broke the clamp on the old derailleur. Since it was old and crappy I decided to buy another one. My bike is very entry level road bike, but it has Shimano 105 components on it. I have been looking at Shimano Ultegra, but its description says that I need a 10 speed setup, but I only have 7 speeds. What would be your recommendation for a derailleur in $40-50 range?

    Crackset is 53/39.
    Seat tube 34.9mm. It must be clamp-on, there is no braze-on notch.
    Back wheel has 7 stars.

    Thanks in advance.

    Setup:


  2. #2
    Senior Member
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    You need a clamp-on front derailleur with the correct clamp size to fit your seat tube.
    The FD needs to be designed for a 7-speed or 8-speed drive-train with a double crank. A 9-speed FD might work but 7 or 8 would be better. You could run an 8-speed chain.

    Al
    Last edited by Al1943; 05-12-09 at 08:06 PM.

  3. #3
    Great State of Varmint Panthers007's Avatar
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    The stops on the FD will allow any FD that works on doubles - just about any - to work just fine without throwing the chain off the chainrings. All this "10spd FD" is ridiculous. This just means it has the range to cover this sort of distance that a 10spd cassette requires. Not that it has to.
    Last edited by Panthers007; 05-12-09 at 02:36 PM. Reason: 'N'
    How do you keep an idiot in suspense?

  4. #4
    Elitist Troglodyte DMF's Avatar
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    There's really no point in looking at Ultegra or DA (in fact, avoid DA - some of the older stuff doesn't work with yours) unless you get a real deal. 105 is quite good enough; for that matter, so is Tiagra. If the prospective unit is otherwise qualified, consider buying used. It's hard to wear out an FD.
    Stupidity got us into this mess - why can't it get us out?

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  5. #5
    Junior Member KO3AK's Avatar
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    Thanks for suggestions. I have been looking around on Ebay for Tiagra models.

    Is it possible to fit a 31.8mm clamp on 34.9mm seat tube?

    Or should I buy a braze-to-clamp adapter?

  6. #6
    Elitist Troglodyte DMF's Avatar
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    Buy the size you need. If you can find an adapter in the right size, that is an alternative.
    Stupidity got us into this mess - why can't it get us out?

    - Will Rogers

  7. #7
    Your mom
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    If you get the wrong size clamp, you should be able to swap it out at the LBS.

  8. #8
    Senior Member
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    Quote Originally Posted by Panthers007 View Post
    The stops on the FD will allow any FD that works on doubles - just about any - to work just fine without throwing the chain off the chainrings. All this "10spd FD" is ridiculous. This just means it has the range to cover this sort of distance that a 10spd cassette requires. Not that it has to.
    Can't agree with that. 10-speed front derailleurs are much narrower than those designed to work with a 7, or 8-speed chain. It might work but would require a lot more trimming than a wider FD. Has nothing to do with "range".

  9. #9
    Senior Member Retro Grouch's Avatar
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    I've got a 105 (double) front derailleur that has had little, if any use. It's a 5500 so I assume that means 9-speed. It's a braze on but I also have a 35.0 braze-on adapter clamp. I'd be willing to trade both for just about any bike stuff that you thought was equal.

    PM me if you're interested.

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