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Thread: Ti frame headtube extension removal question

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    Default Ti frame headtube extension removal question

    I acquired a great ti frameset from Dave Thompson, his Quiring, that has fit great until a couple weeks ago. After putting in some good mileage this fall and winter, and working on my flexibility, it seems that I cannot get enough drop on the front end. The frame has a 3cm headtube extension( 23cm headtube) and I'm considering getting 2.5cm removed of it.

    Do you you think it's worth it? Any idea where I should take it? I'm located in Northern NJ.

    Sean

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    have you tried a -17 degree stem?

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    I did pick up a Ritchey Pro 73 degree stem that I'm going to try this weekend.

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    FWIW removal is pretty straight forward on something like this. Hacksaw first to remove 22mm of the extension and then ream and face it to the final length. Not a home operation for most but simple for a builder. Do you have anyone local you can have deal with it?

    Plus 1 on what Ken said.


    Dave
    D. Kirk
    Kirk Frameworks Co.
    www.kirkframeworks.com


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    I've done it on a steel frame (at home). I used the Park headset facing / reaming tool after carefully sawing. It worked fine. No problems. I went very slow and used cutting oil to keep the heat down. Didn't even damage the paint.

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    Talking

    Make an appointment with Serotta and drive it up to Saratoga.

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    Talking

    Maybe I'll take it to Cylcesport and have them fix me up on a new Legend.:biggrin:

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    The only caution I would add is that if the head tube is machined to be thinner in the middle section, it would probably be best to leave it alone. For instance, the Seven Alaris has a straight guage head tube while the Axiom has a machined head tube that has material removed from the front of the tube in the center section but is full thickness for about a cm at each end. This area of full thickness lends some support to the headset cups. If the HT extension were long enough, you could probably remove enough off the top of the HT to be in the machined area. I would generally not suggest doing this.
    Mike Zanconato
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    Quote Originally Posted by zank View Post
    The only caution I would add is that if the head tube is machined to be thinner in the middle section, it would probably be best to leave it alone. For instance, the Seven Alaris has a straight guage head tube while the Axiom has a machined head tube that has material removed from the front of the tube in the center section but is full thickness for about a cm at each end. This area of full thickness lends some support to the headset cups. If the HT extension were long enough, you could probably remove enough off the top of the HT to be in the machined area. I would generally not suggest doing this.
    Good point!

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    Default disclaimer: i build 29ers.

    Quote Originally Posted by Liberace View Post
    I acquired a great ti frameset from Dave Thompson, his Quiring, that has fit great until a couple weeks ago. After putting in some good mileage this fall and winter, and working on my flexibility, it seems that I cannot get enough drop on the front end. The frame has a 3cm headtube extension( 23cm headtube) and I'm considering getting 2.5cm removed of it.

    Do you you think it's worth it? Any idea where I should take it? I'm located in Northern NJ.

    Sean
    hey, man - if it's a MTB and that 30mm of headtube extension is BELOW the bottom of the downtube then it's likely that long to keep the knobs of your susp. fork from hitting the downtube {this is bad} check it out before you proceed. if this is the case you would be sad when you ruin your frame. steve.
    Last edited by steve garro; 01-30-2009 at 08:39 PM. Reason: clarification
    Steve Garro, Coconino Cycles.
    Frames & Bicycles built to measure and Custom wheels
    Hecho en Flagstaff, Arizona desde 2003
    www.coconinocycles.com
    www.coconinocycles.blogspot.com

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    True Zank.
    Mine was lugged steel with an extension brazed to the to of the head tube lug. I took it down to the braze joint and measured wall thicknes with a micrometer first.

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    Quote Originally Posted by Liberace View Post
    Good point!
    Do you owe me some pictures of a built up bike? :omg:
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    Quote Originally Posted by zank View Post
    Do you owe me some pictures of a built up bike? :omg:
    :adore: It will be cabled up tomorrow evening. I just need to get some neon purple bar tape. Any idea where?

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