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  1. #1
    mtbr member
    Reputation: motorman's Avatar
    Join Date
    May 2011

    Wheel building help needed - spoke offset??

    Hi Folks,

    I have a set of Snowcat rims I am trying to build up for my 29er+ 9Zero7.
    The rim has offset spoke holes that alternate 4mm & 8mm from the rim centreline.

    Wheel building help needed - spoke offset??-cimg1937.jpg

    Question is, how do I enter these figures into the spoke calculator for building the offset rear & non offset front wheel?
    I don't understand which is + & which is -??

    Any help appreciated
    Drink coffee....ride cake

  2. #2
    mtbr member
    Reputation: Velobike's Avatar
    Join Date
    Jun 2007
    I just change the figure for the flange differences to compensate so the calculator doesn't know about the offset.

    Sketch it out. Helps prevent mistakes.
    As little bike as possible, as silent as possible.
    Latitude: 5736' Highlands, Scotland

  3. #3
    mtbr member
    Join Date
    May 2011
    Fat Bike Wheel Building | Golden Bike Shop
    Fat Bike Wheel Spoke Length

    If using a program like freespoke Freespoke with rim and hub offset; then enter the left (Non-drive side) rim as negative (-) offset, meaning the spoke crosses over centerline of the rim, and for the drive side spoke, the rim hole offset is positive. Enter hub offset (17.5) as a positive value. For an offset rear wheel, this should give you two spoke lengths that are very close to eachother (within 1mm). If you get two very different lengths, you did something wrong. Note that with your rim having two slightly different offsets, you can tweak the spoke lengths a tiny bit (to equalize) by selecting which of the offsets is laced to which rim flange, enter at either -4,8 or -8, 4.

    Also note that it is very easy to drill new holes on opposite side of snowcats if needed, such as to change a 32 hole set into a 38 hole set or to use same max possible offset for both sides (Like -10, +10) in order to better equalize the spoke tension...

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