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  1. #1
    hipster traffic dodger ChiapasFixed's Avatar
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    sondelux spoke lenght for 20" wheel. HELP!

    I am having a hard time calculating the spoke length I will need for building my new Sondelux dynamo hub into my 20" Sun CR18 rim (ertro 406).

    Any help would be greatly appreciated as i need to order the spokes from overseas!
    Thank you!
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  2. #2
    AEO
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    what are the measurements for the hub and rim that you've gotten?

    also, what is the spoke count?
    Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
    http://sanfrancisco.ibtimes.com/arti...ger-photos.htm

  3. #3
    hipster traffic dodger ChiapasFixed's Avatar
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    spoke count is 36.
    The measurements for the hub are 50mm flange to flange, 27mm from axle to holes. I know the well on the rim is 17.5mm, but I cant figure out the radius (short of dis-assembling the wheel and measuring it with a tape measure, but I am not ready to do that as i still need to ride the bike until the new spokes arrive!).
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  4. #4
    AEO
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    I can't remember the ERD for CR-18 20", but it's not 389mm, like on the website.
    Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
    http://sanfrancisco.ibtimes.com/arti...ger-photos.htm

  5. #5
    AEO
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    If I remember correctly, the ERD for a 406mm CR-18 was around 392mm.
    but this is on my rim, so yours might be different as it's most likely a different batch.
    Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
    http://sanfrancisco.ibtimes.com/arti...ger-photos.htm

  6. #6
    hipster traffic dodger ChiapasFixed's Avatar
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    found an online spreadsheet that states the ERD for the Sun CR18 406 rim is 395.
    should I trust this? Oh, and spoke count is 32, not 36 as i mistakenly typed above.
    Last edited by ChiapasFixed; 05-04-10 at 11:34 PM. Reason: spoke count
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  7. #7
    Senior Member mrrabbit's Avatar
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    CR-18 20" is typically 392 / 393....that's what the last two I've measured came out to.

    Give me the Shimano part# for the hub - I'll calculate for you..

    =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

  8. #8
    hipster traffic dodger ChiapasFixed's Avatar
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    Quote Originally Posted by mrrabbit View Post
    CR-18 20" is typically 392 / 393....that's what the last two I've measured came out to.

    Give me the Shimano part# for the hub - I'll calculate for you..

    =8-)
    uh, oh! I went with 395 and ordered 180mm spokes, per the formula than came with the hub that said: L = r2 - 17.5mm. I hope I didn't make a mistake, they should arrive tomorrow!

    BTW: it is not a Shimano hub, it is a SONdeluxe from Nabendynamo.com
    IRO Mark V Pro, home made bamboo track bike, eddy merckx corsa extra, Airnimal Joey, UGADA Tikit

  9. #9
    Senior Member mrrabbit's Avatar
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    Quote Originally Posted by ChiapasFixed View Post
    uh, oh! I went with 395 and ordered 180mm spokes, per the formula than came with the hub that said: L = r2 - 17.5mm. I hope I didn't make a mistake, they should arrive tomorrow!

    BTW: it is not a Shimano hub, it is a SONdeluxe from Nabendynamo.com
    Okay...I'll go look up the hubs from that manu...and add to my database...brb.

    =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

  10. #10
    Senior Member mrrabbit's Avatar
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    Assuming the spokes are the guage the hub holes are expecting I get:

    184.86 or 185.00mm for a 36H 3X setup with SONdelux and CR-18 20"

    R=392 (CR-18)
    r=54 (SONdelux hole-to-hole diameter...)
    c=25 (SONdelux flange offset...)
    x=3 (crossings)

    see http://www.mrrabbit.net/wheelsbyflemingapplications.php and download the spreadsheet to calculate yourself...

    =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

  11. #11
    Senior Member mrrabbit's Avatar
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    188.00mm for 32 holes...

    =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

  12. #12
    Senior Member mrrabbit's Avatar
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    Don't panic...2X 32 hole is 178.68mm...so you MIGHT get way with using 180.00mm for 2X if you ordered the spokes already...spokes will go to the top of the nipple for sure...with luck - no further.

    =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

  13. #13
    hipster traffic dodger ChiapasFixed's Avatar
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    ai ai ai!
    well, nothing to do but wait for the spokes to get here and see!
    thanks for your help!
    IRO Mark V Pro, home made bamboo track bike, eddy merckx corsa extra, Airnimal Joey, UGADA Tikit

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