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  1. #1
    mtbr member
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    Geometry parameters to make getting your butt back easiest

    Hi,

    I'm looking at some bikes, and I can't demo them all. I am looking at the geometry of trail and XC bikes and wondering how they compare to my current bike in terms of ease of getting your butt 'off the seat and close to the rear wheel' when going downhill.

    The 2 important parameters to determine this are tob tube length and head tube angle, correct? See the link below for illustration.

    If my current bike is:

    tobtube length=580 mm, headtube angle= 70.5 degrees,

    and i'm comfortable going downhill on it, i'm guessing i'd be pretty comfortable with ease of 'ass of and behind the seat for downhill' on a bike with:

    toptube length =595 mm and head tube angle =69 degrees?

    http://www.trekbikes.com/ca/en/model.../3_series/3500

    Also looking at a cross country bike with tobtube length=594 and headtrube angle=71 degrees.

  2. #2
    squish, squish in da fish
    Reputation: fishwrinkle's Avatar
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    Jul 2012
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    1,004
    dropper post? i dont see how geo is going to help or retard your ability to move. seeing how angles are going to vary upon the grade you are descending.

  3. #3
    mtbr member
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    First, fishwrinkle nailed it.
    1. Dropper post.
    2. Slack ST angle. Yep. This allows your seat to get more forward and easier to get behind as you drop it.
    3. Short stem - this effectively reduces the distance from the bars to the end of the TT.


    All bikes are different. The bike you are looking at is longer but a bit slacker. I'd prefer something even more slack so you can stay centered on the bike without having to hang way off the back.

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