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  1. #1
    mtbr member
    Join Date
    Sep 2005

    Need Headset Help!


    Got a new Cannondale Caffeine 29 today. This is my first Lefty experience. I was changing out the brakes and needed to take the fork off to run the brake line to the handlebars. So far, so good!

    I am now preparing to reassemble the front of the bike. I can't get the fork over the top headset seal. Clamps are not adjustable. I figure maybe you to "finesse" it a little it. Now the top seal is deformed and appears to be hopless. Now I am at a loss for what to do next!?!?!

    I figure I need a new seal, but how do I avoid ruining the new one?

    Any suggestions would be greatly appreciated.

  2. #2
    mtbr member
    Reputation: ccaddy's Avatar
    Join Date
    Jun 2006
    Do you mean you took the cap off of the Lefty and you can't get
    it back on because the large , thin plastic washer(s) that sit's under
    it is no longer round and won't stay in place when you try to put
    the cap back on ?
    If so , these are not seals . They are act more like spacers .
    This happened to me and if they are wrecked , you will need new ones .
    If you put the cap on without these , the lockout will not work .
    If yours has two (mine did) you have to put two back on .
    You can order these from your C'Dale dealer and when you do , order a bunch
    of them so you don't get in this situation again .
    They don't deform everytime the cap comes off but when they do , you
    better have a spare .

  3. #3
    mtbr member
    Join Date
    Sep 2005


    Thanks for the reply.

    I will try to clarify a little.

    This part is rubberized metal that sits between the top headset bearing and the top Lefty clamp. It looks like it seals out dirt and water from the headset bearing. It is not part of the fork.

    At this point, I have it back together without this part.

    I am planning on taking the bike back to the shop and hope that they have an extra and can show me how to put it back together.

    Note to self: Don't take this a part again!

    I swear I am not a mechanical idiot.

  4. #4
    Ridin' dirty!
    Reputation: cdalemaniac's Avatar
    Join Date
    Jun 2007
    I feel your pain bro!
    I had the same problem when I replaced my Lefty FFD to a Lefty Max Carbon. Since the clamps are bonded, there's no way to slide them up or down I guess.
    First, you have to slide the steerer tube almost completely up, lubricate the seal with some silicone spray and try to slide it between the clamp and top bearing. Once it is in place with the steerer tube inserted you can use a tiny flat screwdriver or something to get the "rubber lips" or outside seal seated right.
    If there's another trick out there to get this done more easily let me know, since I bent like 2 seals already.
    "Common sense isn't always that common!"
    Custom Prophet and Custom Delta V

  5. #5
    Join Date
    Jul 2007

    damn seal!


    I'm in the same situation. I sent mine out to be redone and I ended up trashing that top seal while trying to reassemble. I did it once before but this time I bent it all up. I was so close too!!! I tried to put the seal on before the lefty and then put black tape around it to hold it in place while I put the lefty on.. didn't work. I'd love it know if there is a special way to do this or does it just take finesse and patience.

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