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  1. #1
    Senior Member Vieja Cabra's Avatar
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    Ultegra brifters on an LX equipped Trek 520?

    I have a set of Ultegra brifters I want to install.
    It was originally pure Deore LX equipped. The front derailleur and cranks are still LX. The chainrings are 46/36/26. I have long ago upgraded the rear to 9 speed (from 7) and have just been running the barcons in friction mode.
    If I want to keep the 46/36/26 front, do I just need a new front DR? Would Ultegra or 105 have enough curvature to fit the 46 rings? Should I take a grinder to an Ultegra front derailleur to make things fit? I'm not bashful about trying things.

    Suggestions appreciated?
    Last edited by Vieja Cabra; 03-31-09 at 10:26 PM.

  2. #2
    biked well well biked's Avatar
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    Since the front shifter is indexed, it probably won't work well with the mtb front derailleur, the cable pull ratio is different between Shimano road and mtb front derailleurs. The rear shifter will work fine with the LX rear derailleur, as long as the shifters have the same number of "speeds" as the cassette.

    As for a "road" front derailleur working with the 46/36/26 chainrings, I'm currently using a 105 front derailleur on a 46/36/24 setup. It works beautifully. I did use a dremel tool to reshape the 105 FD cage a bit. But I'm using bar end shifters, with friction shifting up front, so I don't know how well it would do with indexed shifters.

    There's a front derailleur, the IRD Alpina, that would be well suited for that, however. They're available from Harris Cyclery-
    Last edited by well biked; 01-17-08 at 04:11 PM.

  3. #3
    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by well biked View Post
    Since the front shifter is indexed, it probably won't work well with the mtb front derailleur, the cable pull ratio is different between Shimano road and mtb front derailleurs. The rear shifter will work fine with the LX rear derailleur, as long as the shifters have the same number of "speeds" as the cassette.

    As for a "road" front derailleur working with the 46/36/26 chainrings, I'm currently using a 105 front derailleur on a 46/36/24 setup. It works beautifully. I did use a dremel tool to reshape the 105 FD cage a bit. But I'm using bar end shifters, with friction shifting up front, so I don't know how well it would do with indexed shifters.

    There's a front derailleur, the IRD Alpina, that would be well suited for that, however. They're available from Harris Cyclery-
    A Tiagra triple front will work as well. It's a better derailer for triples than the 105 or Ultegra and it will work with the Ultegra shifters.
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