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    Frequency or %Droop - Spring rate selection
    #1
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    Hi all.
    I want to select springs for my st-3.
    It seems to me that some of the people choose springs according to a desired natural frequency and some people choose springs according to the desired perceantage of droop and bump.

    It's rear to achieve both of them.


    Which is the prefered method and why?
    Thanks
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    Re: Frequency or %Droop - Spring rate selection
     

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    Re: Frequency or %Droop - Spring rate selection
    #3
    Keeper of the Asylum K-fab's Avatar
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    Frequently seems to be more road racing oriented. I’ve had it introduce to me and it reads like common core math. Makes no sense.
    Off road stuff tends to talk in rate instead. Set up for a drop of 45-60%, depending on terrain use and such.
    FOA has a spring calculator that seems to work quite well. I’m on an iPad, otherwise I’d give you a link. Search FOA Spring Rate Calculator
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    Re: Frequency or %Droop - Spring rate selection
    #4
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    The FOA calculator hasn't been working for me lately, not sure if its me or them
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    Re: Frequency or %Droop - Spring rate selection
    #5
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    * FOA did not worked for me as well but they give a link to another calc (exactly the same) which based on %drop and not frequency.

    As for frequency design goal - I got confused because as far as I know, specific frequency has specific static deflection which will not always satisfies desired drop.
    Lets say I want to have 1.5 Hz frequency. according to the formula marked below I will always have a static deflection of 4.34".
    Now, for 16" wheel travel I will have about 25% drop but if I have 25" wheel travel I will have only 17" drop.
    Long travel suspension cannot satisfy both design goals.

    Is it correct?

    Fn vs D.jpg
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    Re: Frequency or %Droop - Spring rate selection
    #6
    The Wizard bdkw1's Avatar
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    Forget frequency. Set your rate so that you have as close to zero preload possible.

    I don't know what happened to all the good spring calculators but all the ones I have seen lately are crap.
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