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  1. #1
    Senior Member bellweatherman's Avatar
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    What's the absolute minimum amount of seatpost that is safe to have in the seat tube?

    Just wondering what the minimum amount of seat post I can safely have in the seat tube? If a seat post if listed as 250mm, is that 250mm from the top to the minimum insertion line?
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  2. #2
    Senior Member jaxgtr's Avatar
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    look on the bottom of the post and make sure the safe mark is not showing. That would be the amount.
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    Senior Member Torchy McFlux's Avatar
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    About 2-1/4" for a road bike, 3" for a mountain bike.

  4. #4
    Low car diet JiveTurkey's Avatar
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    Quote Originally Posted by bellweatherman View Post
    Just wondering what the minimum amount of seat post I can safely have in the seat tube? If a seat post if listed as 250mm, is that 250mm from the top to the minimum insertion line?
    The length of the seat post is generally measured from the saddle clamp to the very end, which includes the part that must be in the frame. A 350mm post I have has about 100mm between the minimum insertion line and the end, so the saddle rails could only be up to 250mm above the seat tube.
    Last edited by JiveTurkey; 06-08-08 at 12:51 AM.
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  5. #5
    Pwnerer Wordbiker's Avatar
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    Look at the frame.

    The bottom of the post should be below the bottom weld (if a metal frame, of course) on the toptube. Any less and you risk snapping the top of the seattube off.
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