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  1. #1
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    Replacing a fork with shorter steering tube length, do it or not?

    I just bought a montague paratrooper that came with a XCT fork w/80mm travel. I have a XCR /w 100mm travel and remote lockout from another bike that I really like that I installed on the new paratrooper.

    But the problem is the steering tube(7.7") on the XCR is about 0.7" shorter than that of the XCT (8.4") . I look and feel like the XCR is too short for this bike. The handlebar is too low to ride comfortably. I know I can change to a stem with large angle to raise the handlebar. But then I probably need to change the stem length as well since the larger angle would bring the handlebar too close. It seems like doing this would open the door to other problems.

    My real question is: Is there a minimum length/height that the steering tube should rise above the top headset bearing? My XCR tube only 1.8" above the top headset bearing.

    I hope someone with related experience would kindly shed some light on this topic. Thanks a lot!
    Replacing a fork with shorter steering tube length, do it or not?-paratrooperlg2012.jpg

  2. #2
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    If you have an aluminum steerer you need at least 90% of the stem clamping the steerer.

    Your options are, remove spacers(obviously), use a lower stack height stem, or a lower profile headset.

    And this site is pretty good at helping to calculate stem fit
    Stem Comparison Tool | yojimg.net
    Raised in a Chicken-Coop by Chickens

  3. #3
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    Quote Originally Posted by Sheepo5669 View Post
    If you have an aluminum steerer you need at least 90% of the stem clamping the steerer.

    Your options are, remove spacers(obviously), use a lower stack height stem, or a lower profile headset.

    And this site is pretty good at helping to calculate stem fit
    Stem Comparison Tool | yojimg.net
    Thanks for the info!

    I do have at 90% stem clam surface on the tube. It's just that now the stem is only separated by a 10mm spacer from the top headset. Seems too short.

    The chart certainly would help me choose the right stem. Thanks!

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