Calculating Spoke Length

Discussion in 'Wheel Building' started by Mikie, Jan 12, 2021.



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  1. Mikie

    Mikie Admin/iMTB Hooligan

    Location:
    North East Canada? , California
    Name:
    Mikie Watson
    Current Bike:
    Ibis DV9, Santa Cruz Hightower
    Obviously there are Online Spoke Calculators but having watched several Vids on, "How to calculate your spoke length" there are accurate ways to get your unique data and plug into Online Calculators to get a more accurate length for your spoke. These are the two I watched:



     
    fos'l, Danmtchl, Faust29 and 3 others like this.
  2. mtnbikej

    mtnbikej J-Zilla

    Location:
    Orange
    Name:
    J
    Current Bike:
    SC Chameleon SS, SC Hightower
    I generally use 2 different spoke calculators when I run my spoke numbers.....just in case.

    My go to online calc is:
    http://www.kstoerz.com/freespoke/

    They have a nice library of hub and rim dimensions.
    I like that they give you the Spoke tension% for both sides
    Here is a sample I ran:
    https://kstoerz.com/freespoke/?link=1&rim=469&hub=318&n=32&xL=3&xR=3

    Screenshot (235).png

    There is also the the industry standard:

    https://spokes-calculator.dtswiss.com/en/calculator

    They have all the dimensions for DT branded parts, so if you wanna use it for some other hub manufacturer or rim, you'll have to provide those.

    The DT Spoke calc allows you to change the different nipple lengths which is kinda nice. It also rounds the spoke lengths to the recomended need.



    I have found that you can generally use a 1mm longer or shorter spoke length.....so if you need 16x 291 and 16x 292.....you could get 32x of just one size.
     
    Faust29, Old&InTheWay, Mikie and 2 others like this.
  3. Mikie

    Mikie Admin/iMTB Hooligan

    Location:
    North East Canada? , California
    Name:
    Mikie Watson
    Current Bike:
    Ibis DV9, Santa Cruz Hightower
    Wow! That is really awesome J!

    As well, it's amazing how fragile a wheel "looks" compared to how strong they really are...
     
  4. Faust29

    Faust29 Moderator

    Location:
    irgendwo
    Name:
    B. Bunny
    Current Bike:
    2 SC and a STDM
    There's math involved ? I can barely remember my phone number nowadays. :thumbsdown:
     
    Mikie, DangerDirtyD, Grego and 2 others like this.
  5. Danmtchl

    Danmtchl iMTB Rockstah

    Location:
    Bakersfield
    Name:
    Dan
    Current Bike:
    2020 Trek Fuel EX 9.7
    Mikie and mtnbikej like this.
  6. Grego

    Grego iMTB Addict

    Location:
    Fullerton
    Name:
    joe
    Current Bike:
    WFO9
    Finally a use for that trigonometry class...


    formula2.png


    R = Rim radius (half the ERD)
    H = Hub flange radius
    F = Hub flange offset
    X = Cross pattern
    h = Number of spokes in the wheel
    d = Diameter of the spoke hole in the hub
     
    Faust29, Mikie and Danmtchl like this.
  7. mtnbikej

    mtnbikej J-Zilla

    Location:
    Orange
    Name:
    J
    Current Bike:
    SC Chameleon SS, SC Hightower

    3IaBXRa.gif

    [​IMG]
     
    Mikie, Danmtchl and Grego like this.
  8. Mikie

    Mikie Admin/iMTB Hooligan

    Location:
    North East Canada? , California
    Name:
    Mikie Watson
    Current Bike:
    Ibis DV9, Santa Cruz Hightower
    I could not put it better myself!
    :coffee::gotnothing:What the hail @Grego !?!?!?
     
    Grego and mtnbikej like this.
  9. Faust29

    Faust29 Moderator

    Location:
    irgendwo
    Name:
    B. Bunny
    Current Bike:
    2 SC and a STDM
    Now, that I can still do! :Roflmao
     
    Grego and Mikie like this.



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