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Thread: Spoke Length

  1. #1
    the bike made me do it oneredstar's Avatar
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    Spoke Length

    I am going on a tour next week and need to bring a few spare spoke on my trip. I built my wheels on my bike, but now for thee life of me, I cannot find the spoke lengths I wrote down.

    I have looked at 2 different spoke length calculators online and just cannot figure it all out anymore.

    If someone could help that would be great.

    Front Rim: Mavic XM 317 Disc
    Front Hub: Shimano Deore XT HB M756

    Rear Rim: Mavic XM 317 Disc
    Rear Hub: Shimano Deore XT FH M756

    Spoke Pattern: 3 cross

    Any help on spoke lengths would be great. Thanks

  2. #2
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    Take one of each size off the wheels and measure them. At least that will tell you how long they are now.

  3. #3
    the bike made me do it oneredstar's Avatar
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    Quote Originally Posted by Al1943 View Post
    Take one of each size off the wheels and measure them. At least that will tell you how long they are now.
    The wheel is perfectly trued and tensioned at this point and taking spokes out is the last thing I wanted to do. Any other ideas? Help with spoke calculator.

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    I wouldn't fool with a trusted aligned wheel, it's bad karma if nothing else.

    You can measure your existing spokes easily enough if you're willing to remove a tire.

    Place something across the flanges of the rim above a nipple, measure the drop to the top of the nipple. Now measure along a spoke from the hub to the outside of the rim, subtract the drop and you're home. Note, that spokes are sized from inside of the elbow to the end so measure correctly, and you should deduct 1mm so the spoke comes up slightly short of the top of the nipple.
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  5. #5
    the bike made me do it oneredstar's Avatar
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    Quote Originally Posted by FBinNY View Post
    I wouldn't fool with a trusted aligned wheel, it's bad karma if nothing else.

    You can measure your existing spokes easily enough if you're willing to remove a tire.

    Place something across the flanges of the rim above a nipple, measure the drop to the top of the nipple. Now measure along a spoke from the hub to the outside of the rim, subtract the drop and you're home. Note, that spokes are sized from inside of the elbow to the end so measure correctly, and you should deduct 1mm so the spoke comes up slightly short of the top of the nipple.
    Will do. Thanks

  6. #6
    Senior Member mrrabbit's Avatar
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    Everything is in my spreadsheet:

    http://www.mrrabbit.net/wheelsbyflemingapplications.php


    Just look up the rim ERD....follow the instructions in the calculation tab....take the results and round 'em down to nearest 1/2 mm if needed.

    =8-)
    4000+ wheels built since 1984...

    Disclaimer:

    1. I do not claim to be an expert in bicycle mechanics despite my experience.
    2. I like anyone will comment in other areas.
    3. I do not own the preexisting concepts of DISH and ERD.
    4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
    5. My all time favorite book is:

    Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life

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    How many spokes?

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