1. The most important thing about buying a new bike is to make sure it fits. The only way you'll know if the bike is right for you is to size up the bike and make sure that the bike's geometry matches your body's geometry. Ask questions and do some research.
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  1. #1
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    Bottom Pull Front Derailleur

    I have an XT front derailleur but I am under the impression that it will not fit the frame i am expecting. The frame is a steel Marin and on the pictures i can see 2 cable bosses on the down tube. Are my fears correct? Will I need to get another front derailleur? Thanks.
    Last edited by Markleo; 07-28-2008 at 05:34 AM.

  2. #2
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    It depends on the model....

    of the derailleur. Starting with the M760 model the XT front derailleurs went to a "dual pull" system that allows them to be used either top or bottom pull. Earlier models came in either top or bottom pull specific configurations. So all may not be lost. Check the model of front d that you have. If you can't figure it out post a pic showing the area around the cable clamp as clearly as possible. We'll be able to tell you one way or the other.

    Good Dirt
    "I do whatever my Rice Cripsies tell me to!"

  3. #3
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    Quote Originally Posted by Squash
    of the derailleur. Starting with the M760 model the XT front derailleurs went to a "dual pull" system that allows them to be used either top or bottom pull. Earlier models came in either top or bottom pull specific configurations. So all may not be lost. Check the model of front d that you have. If you can't figure it out post a pic showing the area around the cable clamp as clearly as possible. We'll be able to tell you one way or the other.

    Good Dirt
    Thanks for the answer. It says FD-M739 on it.

  4. #4
    dh1
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    You will also need to know if the der is top/bottom swing, and what size clamp it has.

    In most cases the top/bottom swing issue isn't an issue, but in some cases a top swing will fit and the other wouldn't and vice/versa. How it clamps to the frame (clamp diameter) has to match the seat tube diameter, or you will not be happy either.

  5. #5
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    In googling FD-M739, I find several things:
    - it was made in 1996-1997
    - many places state its for 7&8 speeds only, yet someone said it would work with 9 speed.
    - it says you could get either Top Pull (TP) or Bottom Pull (BP):
    http://cicloviajes.com.ar/MecaDeoreXT97.htm
    - on weight weenies, someone mentions TP, so that verified they made in Top Pull:
    http://weightweenies.starbike.com/li...ontderailleurs
    - in this example, someone is selling a BP (you can see on the sticker) so that verifies they made in Bottom Pull version too:
    http://topring.pinkbike.com/photo/1323694/


    Which version do you have, TP or BP? A top pull has the cable from the front shifter coming down from the upper seat tube and the cable pulls up to rotate the mechanism to have the derailleur move to the large ring. A bottom pull is just the opposite, pulls from under the Bottom Bracket, mechanism gets pulled down to rotate & therefore move the derailleur to large ring.

  6. #6
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    I was searching too and I saw somewhere that it works both ways. I used to have it on a bike that was working "top pull" now my new frame that is on its way seems to have routes for bottom pull. I hope it works. I have 8 speeds so that what you mentioned would not be a problem.

  7. #7
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    Quote Originally Posted by Whitedog
    In googling FD-M739, I find several things:
    - it was made in 1996-1997
    - many places state its for 7&8 speeds only, yet someone said it would work with 9 speed.
    - it says you could get either Top Pull (TP) or Bottom Pull (BP):
    http://cicloviajes.com.ar/MecaDeoreXT97.htm
    - on weight weenies, someone mentions TP, so that verified they made in Top Pull:
    http://weightweenies.starbike.com/li...ontderailleurs
    - in this example, someone is selling a BP (you can see on the sticker) so that verifies they made in Bottom Pull version too:
    http://topring.pinkbike.com/photo/1323694/


    Which version do you have, TP or BP? A top pull has the cable from the front shifter coming down from the upper seat tube and the cable pulls up to rotate the mechanism to have the derailleur move to the large ring. A bottom pull is just the opposite, pulls from under the Bottom Bracket, mechanism gets pulled down to rotate & therefore move the derailleur to large ring.
    http://www.mammoet.nl/store/catalog/...fc6293d4a5469b

  8. #8
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    i also found this but

    i am not sure if i understand

    http://members.vol.at/schoenach/mtb/...schaltung.html

    does it say if it is top and/or bottom pull? Thanks

  9. #9
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    I saw that Mammoet link when I was searching also, and it says 'dual pull', but all the specs look like they copied specs from a newer derailleur, so I didn't post that link. I don't think they were doing 'dual pull' back in 1997.

    On the other link, under the FD-M739 section, under the topic 'Cable Routing', it says 'top & bottom route types available'. Again, I take this to mean they made a Top pull version and separately a bottom pull version.

    Can you post a picture of your derailleur as Squash had asked above? If so, we could tell you if it was Dual Pull or not. The Dual Pull versions have a little 'pulley-thing' that the cable can wrap around. In the picture below of a Dual Pull, the left side derailleur is routed as bottom pull, the cable coming up from bottom, looping into that 'pulley' thing, then across to the clamp screw. On the right is the top pull route, with the cable coming direct from above straight to the cable clamp. If your derailleur doesn't have this 'pulley-thing', then it's not a Dual Pull.

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