Bonehead Math - Steerer Tube Length and Minimum Insertion to Stem- Mtbr.com
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  1. #1
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    Upset Bonehead Math - Steerer Tube Length and Minimum Insertion to Stem

    OK, I have been slowly building up parts for my "budget" SS build for about 5 months. I finally got my frame sanded and rattlecanned and got my headset pressed in. I install the crown race on my $8 ebay GT cromo fork and slide it through the headset...

    I can't believe my miscalculation, but I only have 15/16" of steerer above the top of the headset. The steerer is still uncut. My stem is 1.5" tall and I am wondering if this amount of insertion is enough. I am guessing not since the standard top bolt just touches the top of the star nut, so I need a longer bolt at the very least.

    Any advice, other than to get a new fork with a longer steerer?

    Thanks.

  2. #2
    Chillin the Most
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    It's been my understanding that the steerer tube should be no less than 5mm (1/4") below the top of your stem, but I could be mistaken. Although this sounds right.?.? Yeah, I'm pretty sure thats correct........yeah.

  3. #3
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    budget it is

    Quote Originally Posted by ccwenk
    Any advice, other than to get a new fork with a longer steerer?

    Thanks.
    Nothing that would be cheaper than another fork at $8.

    (e.g. get a new steerer tube pressed into the fork)

  4. #4
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    A stem with less "stack height" will do the job. You need to get one with less than 30mm (about 1-1/4 inch) I'd say; if its less than 25mm, you can run a spacer underneath!

    Cheaper stems tend to have more stack, because its a cheap way to design in strength without adding a lot of weight. The Easton Vice stem has a 1" stack, would be perfect (if its the right length / rise for yah), but it costs almost $50! It might be you could find a cheapn low-stack road stem and run shims to hold the bar... but it will probably be flexy.

    Best and cheapest solution looks like new fork. You can probably e-bay the old one, too, given the rage for ridged SS going on...

  5. #5
    H8 H8 H8
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    Saago

    Quote Originally Posted by ccwenk
    OK, I have been slowly building up parts for my "budget" SS build for about 5 months. I finally got my frame sanded and rattlecanned and got my headset pressed in. I install the crown race on my $8 ebay GT cromo fork and slide it through the headset...

    I can't believe my miscalculation, but I only have 15/16" of steerer above the top of the headset. The steerer is still uncut. My stem is 1.5" tall and I am wondering if this amount of insertion is enough. I am guessing not since the standard top bolt just touches the top of the star nut, so I need a longer bolt at the very least.

    Any advice, other than to get a new fork with a longer steerer?

    Thanks.
    I was just in this situation. An Avid SAAGO stem with a collet style clamp will fix you
    up right. I just got one new in box off e-bay for about $25. You might find a used rigid
    fork for less than that, but it's an option. The guy I bought it from has a bunch of them
    in a pretty good assortment of sizes. It's a nice stem.

    ZB
    Yeah, it's strange. But oh well.

  6. #6
    6x7=Dont Panic!
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    I'm running a stem on a short steerer and have no problem. Its a ritchey stem and they said that its fine to use it on a short steerer as long as the top of the steerer comes to the center of the top stem bolt. Or you could always get a used thomson. That clamp covers a lot of surface area and should work very well with a short steerer.
    Herro prease

  7. #7
    semi-evolved simian
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    How much steerer tube do you need ? I've got a cromo fork gathering dust in the back of the garage that you'd be welcome to have if it's long enough.1 1/8" steerer or 1"? If not that one then I'm sure someone else on the forum has one.

  8. #8
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    It is 1 1/8" and I need 8.5" of steerer.

    I am considering just biting the bullet and getting the Surly or the Kona P2 fork. I found the guy on ebay with the SAAGO stems, but technically I don't have enough steerer even for that. I have 23mm of steerer protruding above the headset and the SAAGO wants >26mm.

    If someone does have a rigid fork that meets the above criteria that they are looking to get rid of, let me know. I hope this doesn't set off the SPAM police. Thanks for the offer.

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