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  1. #1
    Junior Member
    Join Date
    Feb 2005
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    29 Palms
    My Bikes
    Building Trek 2300 w/ Ultegra and AC420s
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    Front Derailleur Size

    Getting ready to purchase new Ultegra front derailleur for a 2004 TREK 2300 (complete buildup). My choices are:

    - 31.8/ 28.6 mm

    - 34.9

    - braze on

    Can anyone help me with the right size?

    derwagon

  2. #2
    mousse de chocolat Moose's Avatar
    Join Date
    Jul 2001
    Location
    Northeast Ohio, USA
    My Bikes
    Soma Double Cross, Raleigh Rush Hour, Fuji America Fixed, "Modernized" Gitane
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    The size refers to the diameter of the clamp that goes around your seat tube, a quick measurment should reveal the answer. Unless of course the frame is equipped with braze-ons for the FD (I looked at the pic on Trek's website and couldn't really tell) then your choice would be the latter.
    I feel more like I do now than when I first got here.

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