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  1. #1
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    Shorter seat tubes for more clearance?

    Hi, I'm new to understanding the science of bicycles and whatnot and was curious about the idea of a shorter seat tube and how it supposedly gives you more clearance.

    I keep reading that due to the shorter seat tube you need to run a longer seat post and have more of it stick out of the seat tube...Why is that?

    Also, how does the longer seatpost then absorbs more bumps and make for a more comfortable ride? Is it simple because more seatpost means more flex and it's not as stiff?

    Thank you.

  2. #2
    dru
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    'More clearance' means more clearance between the family jewels and the top tube of the frame.

    If you have a 'shorter seat tube' then obviously you'll need to have more of the seat post sticking out for a given saddle height.

    Yes, a longer seat post will flex more than a short one giving perhaps some compliance.

    Drew
    occasional cyclist

  3. #3
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    Thank you so much.

    Does the sloping top tube play into this? Because it's sloping downward towards the seat tube it allows for a shorter seat tube and thus making you use more seatpost?

  4. #4
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    That's exactly it. If you look at old (80s) mountain bikes, most of them had level (or nearly so) top tubes, like road bikes. But, mountain bikers found they enjoyed the extra standover clearance, so sloping top tubes have taken over.

    Quote Originally Posted by Mtrain17 View Post
    Thank you so much.

    Does the sloping top tube play into this? Because it's sloping downward towards the seat tube it allows for a shorter seat tube and thus making you use more seatpost?

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