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  1. #1
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    Spoke length for straight pull hub in a cyclocross wheel

    I am building a race tubular, disc brake, 28-spoke, 3 cross wheel using an XTR 9020 straight pull, 142 mm, 12-mm thru-axle hub and a Major Tom rim. Itís been a challenge for me to get all the hub measurements, but I collected the required data and input those into the DT spoke length calculator.

    I am having trouble measuring the offset. As near as I can tell it's pretty close to 0, because of the angled nature of the flanges on the hub. By angling the flange, this moves the spoke head closer to the hub center line, possibly even to the center line. Does anyone have experience with this type of a hub and know how to determine spoke offset?

    Spoke length for straight pull hub in a cyclocross wheel-xtr-hub.jpg

  2. #2
    'brifter' is a lame word.
    Reputation: cxwrench's Avatar
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    28 hole 3 cross? Not 2x? Wasn't that wheel originally 2x?
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  3. #3
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    As far as I know the offset parameter is rim hole differ from bead center line. Should be 0 if let me. Nothing about hub's.

  4. #4
    'brifter' is a lame word.
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    Oh yeah...I was thinking about the 28h/3x thing. The spoke offset has nothing to do w/ the hub, it's a rim thing. If your spoke holes are offset to NDS of the rim, that's the 'offset'.
    I work for some bike racers
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  5. #5
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    Bought the hub used. Don't know original setup.

  6. #6
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    DT spoke calculator only requests a spoke offset with straight pull hubs. Image taken directly from DT website is shown below. The offset indeed seems to refer to the hub. The flanges on a straight pull hub offset the spoke a distance from the hub center line. The offset is to compensate for the thickness of the flange and hence the offset. In the case of this XTR hub, the flanges aren't parallel with the long axis of the hub. The angled nature of the flanges decreases the offset. The offset is typically 2.0 - 2.5 mm for straight pull hubs. However, this doesn't seem appropriate for this hub.
    Spoke length for straight pull hub in a cyclocross wheel-spokeholeoffset.jpg

  7. #7
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    Quote Originally Posted by mmorra View Post
    DT spoke calculator only requests a spoke offset with straight pull hubs. Image taken directly from DT website is shown below. The offset indeed seems to refer to the hub. The flanges on a straight pull hub offset the spoke a distance from the hub center line. The offset is to compensate for the thickness of the flange and hence the offset. In the case of this XTR hub, the flanges aren't parallel with the long axis of the hub. The angled nature of the flanges decreases the offset. The offset is typically 2.0 - 2.5 mm for straight pull hubs. However, this doesn't seem appropriate for this hub.
    Click image for larger version. 

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    In that case measure yourself on two side of nipple flanges and divid it by 2 and you get offset. Should resolve the problem now.

  8. #8
    coaster
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    It's easier to get the hub specs from the manufacturer than measure it.

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