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  1. #1
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    Help with front derailleur setup on Carlton

    Unable to post pics for some reason so will do my best to explain.

    Getting closer on getting my dads Carlton back together and discovered an issue with front derailleur setup. In short when I received the bike it had no front derailleur and the front derailleur down tube shift lever was missing... Then trying to figure what derailleur I will need I discovered no cable guide ?? So after reading post from searching the board it looks like I need a clamp on cable guide ? Single or I believe double will also work just wouldn't use the guide for the rear as it has braze on's for cable housing routing.

    Now I also discovered from the search I have one braze on for the non drive side just above the bottom bracket shell on the down tube. From what I found possibly I can run a piece of outer housing and cable from that braze on under the bottom bracket shell into the front derailleur cable clamp ?

    Also will I need a bottom pull front derailleur ? Running double rings up front.

    Hopefully I didn't confuse everyone.

    KF

  2. #2
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    If you have a cable stop brazed onto your downtube then you can use a piece of cable housing routed under the BB and you can use a pull down style FD.

  3. #3
    Ed.
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    Way back, in the beginning of time, at least some front derailleurs had built-in cable stops (Campag and Cyclo for two). Running the housing under the BB will work fine.

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    Great I was thinking that would work but wanted to be sure.

    Quote Originally Posted by Wulf View Post
    If you have a cable stop brazed onto your downtube then you can use a piece of cable housing routed under the BB and you can use a pull down style FD.

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    Sounds good thanks!
    Quote Originally Posted by Ed. View Post
    Way back, in the beginning of time, at least some front derailleurs had built-in cable stops (Campag and Cyclo for two). Running the housing under the BB will work fine.

  6. #6
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    Another question I have I understand I can run from my braze on cable stop on the down tube with cable and housing but have no stop or finding a replacement derailleur with a cable stop... how do I add a stop at the derailleur end ?

    KF

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    Do I just get a separate clamp on cable stop and mount it below the front derailleur ??

    Quote Originally Posted by kflagg View Post
    Another question I have I understand I can run from my braze on cable stop on the down tube with cable and housing but have no stop or finding a replacement derailleur with a cable stop... how do I add a stop at the derailleur end ?

    KF

  8. #8
    Senior Member DiegoFrogs's Avatar
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    You get a front derailleur that has the stop integrated into the design of the derailleur. I have a Suntour Cyclone like this, and there are many others. Then, you run housing between the stops.

  9. #9
    coprolite fietsbob's Avatar
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    There are clamp on double cable guides , they pass the cable over the BB.. Campagnolo made them too .

    where is the stop on the chain stay? there are clamp on ones for that too.

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    Senior Member Grand Bois's Avatar
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    Quote Originally Posted by DiegoFrogs View Post
    You get a front derailleur that has the stop integrated into the design of the derailleur. I have a Suntour Cyclone like this, and there are many others. Then, you run housing between the stops.
    Quote Originally Posted by fietsbob View Post
    There are clamp on double cable guides , they pass the cable over the BB.. Campagnolo made them too .

    where is the stop on the chain stay? there are clamp on ones for that too.
    He has a brazed on stop on the down tube near the BB. I don't know what a stop on the chain stay has to do with the current discussion.

  11. #11
    coprolite fietsbob's Avatar
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    didn't see pictures .. glad you have seen them .

    if the rear chainstay stop is above the chainstay cable has to pass over the BB.

    of course .

  12. #12
    Ed.
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    Quote Originally Posted by kflagg View Post
    Do I just get a separate clamp on cable stop and mount it below the front derailleur ??
    You shouldn't need one. Both cables on my Raleigh run thru short lengths of tubing under the BB with no stops. The only issue I can imagine is the housing, being unrestrained at one end, might tend to creep in that direction.

  13. #13
    Senior Member SJX426's Avatar
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    Depending on what you whant the end results to look like, you might want to consider doing what I now do everytime there is an under the BB routing that doesn't have a plastic guide:


    Use hot glue to hold the housing or liner in place to keep it from creeping.

  14. #14
    Senior Member Grand Bois's Avatar
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    Quote Originally Posted by fietsbob View Post
    didn't see pictures .. glad you have seen them .

    if the rear chainstay stop is above the chainstay cable has to pass over the BB.

    of course .
    No pictures needed. Just read more carefully:

    "Now I also discovered from the search I have one braze on for the non drive side just above the bottom bracket shell on the down tube."

    Cable routing to the RD is not at issue.

  15. #15
    Senior Member due ruote's Avatar
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    Quote Originally Posted by Grand Bois View Post
    No pictures needed. Just read more carefully:

    "Now I also discovered from the search I have one braze on for the non drive side just above the bottom bracket shell on the down tube."

    Cable routing to the RD is not at issue.
    This is why I don't understand all the discussion of routing the cable under the BB. Pics would be most helpful.

  16. #16
    Senior Member Grand Bois's Avatar
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    Quote Originally Posted by due ruote View Post
    This is why I don't understand all the discussion of routing the cable under the BB. Pics would be most helpful.
    The frame is set up for a FD that has a housing stop. A loop of housing runs from a stop on the down tube to the FD. You can run housing from the stop on the DT under the BB to a FD with no stop, but it will look like crap, IMO. I would do it only as a temporary kludge until I could find a FD with a stop.

    My Gitane, Peugeot and Jeunet al have front derailers with stops, but it's not just a French thing.

  17. #17
    Senior Member SJX426's Avatar
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    I knew one of my bike had this configuration! Well it is my wifes!

  18. #18
    incazzare. lostarchitect's Avatar
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    Quote Originally Posted by Grand Bois View Post
    The frame is set up for a FD that has a housing stop. A loop of housing runs from a stop on the down tube to the FD. You can run housing from the stop on the DT under the BB to a FD with no stop, but it will look like crap, IMO. I would do it only as a temporary kludge until I could find a FD with a stop.

    My Gitane, Peugeot and Jeunet al have front derailers with stops, but it's not just a French thing.

    I agree, this is ugly. You have two decent solutions.

    1. Get a FD with an integrated cable stop, and run housing from your downtube stop to the FD. This is the best solution.

    2. Use your FD without a stop, and get a bolt on cable stop (like this - make sure you get the right size!), then run housing from your downtube cable stop to the bolt on stop.
    1964 JRJ (Bob Jackson), 1973 Wes Mason, 1989 Trek 520, 2000ish Colian (Colin Laing), 2013 Velo Orange Pass Hunter

  19. #19
    Senior Member Grand Bois's Avatar
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    They're not too hard to find.

    front derailleur with stop | eBay

  20. #20
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    Yes I found a few but still may go for one without and use a separate cable stop mounted below.
    Quote Originally Posted by Grand Bois View Post
    They're not too hard to find.

    front derailleur with stop | eBay

  21. #21
    Ed.
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    Quote Originally Posted by lostarchitect View Post
    I agree, this [routing under the BB] is ugly. ...
    Begging your pardon, that's the way Gerald O'Donvan (AKA GOD) built all (as far as I know) the Raleigh SBDU bikes. It's not ugly, in fact it's rather attractive in a minimalist sort of way. I do realize, in this particular case, that there would be an unused cable stop on the down tube. While a derailleur with an integral stop is to be preferred, if one wasn't to be found this [routing under the BB] would be a perfectly suitable solution.

  22. #22
    incazzare. lostarchitect's Avatar
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    Quote Originally Posted by Ed. View Post
    Begging your pardon, that's the way Gerald O'Donvan (AKA GOD) built all (as far as I know) the Raleigh SBDU bikes. It's not ugly, in fact it's rather attractive in a minimalist sort of way. I do realize, in this particular case, that there would be an unused cable stop on the down tube. While a derailleur with an integral stop is to be preferred, if one wasn't to be found this [routing under the BB] would be a perfectly suitable solution.
    I'm talking about routing a piece of housing from the downtube cable stop, under the BB and then having the end of it stick up loose behind the seat tube. Is that what you're referring to? If so, then yes, it is ugly and sloppy, and I don't care who did it.
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  23. #23
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    I think this is what you want, , this FD uses the down tube cable stop , a short piece of outer goes to the DR stop, its neat and effective, this DR is slack cable bug ring, so the shift lever goes forward for faster like the rear DR.

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