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Old 05-04-10, 10:39 PM   #1
ChiapasFixed
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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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Old 05-04-10, 10:52 PM   #2
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what are the measurements for the hub and rim that you've gotten?

also, what is the spoke count?
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Old 05-04-10, 10:59 PM   #3
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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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Old 05-04-10, 11:04 PM   #4
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I can't remember the ERD for CR-18 20", but it's not 389mm, like on the website.
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Old 05-04-10, 11:18 PM   #5
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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.
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Old 05-04-10, 11:34 PM   #6
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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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Old 05-05-10, 02:04 PM   #7
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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-)
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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.
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Old 05-05-10, 11:18 PM   #8
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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
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Old 05-06-10, 12:54 AM   #9
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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-)
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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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Old 05-06-10, 12:06 PM   #10
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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-)
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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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Old 05-06-10, 12:08 PM   #11
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188.00mm for 32 holes...

=8-)
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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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Old 05-06-10, 12:10 PM   #12
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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-)
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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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Old 05-06-10, 10:22 PM   #13
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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!
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