Spoke length for WTB Asym i29 Rims- Mtbr.com
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  1. #1
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    Spoke length for WTB Asym i29 Rims

    Hi there,

    Purchased two WTB i29 asym rims which are to be mated with a Shimano & SON28 hub.

    Is it possible to calculate the spoke length factoring in the asym hole offset? I'm getting varied results from the online calculators between 275mm and 284mm!

    Rim specifics:

    27.5" 563 584x29c 32h / 4.5mm

    Rear Hub specifics:

    Series: SLX M7000
    Over-Locknut-Diameter: 135 mm
    Spoke Hole Count: 32
    Axle Length: 146 mm
    Axle Diameter: 10 mm
    Pitch Circle Diameter: 44 mm left, 45 mm right
    Flange Diameter: 52.8 mm left, 53.8 mm right
    Flange Distance: 57.4 mm
    Offset: 6.6 mm

    Front Hub

    Spoke length for WTB Asym i29 Rims-son.png

    Many thanks!

    Andrew

  2. #2
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    Have you used a calculator that allows you to enter the run offset? I'm not sure why you're getting such variable numbers,
    I use Roger Musson's calculator @ Spoke length calculator for wheel building
    For your front wheel, assuming a 1.8 spoke diameter (eg Sapim Race or DT Comp), and 3 cross lacing I get 271.9 left, 271.2 right.
    The numbers you list for the Rear hub are confusing, you have PCD and hub diameter as different numbers but the measurement used to calculate is PCD or distance between opposite spoke hole centers not the full flange diameter, ie 44 & 45mm. I found the flange distance measurements for the rear SLX as 33.7 left, 20.5 right; plugging those in gives 273.6 left 272.9 right. Try using these numbers and you should get consistent results although different calculators may use different algorithms, but shouldn't be off by 9mm.
    I strongly suggest you measure the ERD yourself, it's often off by a couple of mm from what's listed. Good luck!

  3. #3
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    I believe that's the one I was getting around the 274mm mark. Thanks for being another set of eyes, ordering now. Regards, Andrew

  4. #4
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    You don't even plug in the 3mm offset. It makes no difference.

  5. #5
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    It's true the offset makes little difference. The i29 is 4.5mm, so about .5mm or so per spoke in this case. But, it's easy to plug in so why not?

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