20 Spoke Dynamo Hubs?
06-18-18, 07:28 AM
#1
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20 Spoke Dynamo Hubs?
Who all makes 20 spoke dynamo hubs? I’ve found SP and Biologic both for around $130. Is there anything cheaper out there? A disk verson would be cool, but not necessary.
06-18-18, 07:36 PM
#2
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Shimano did a 20 spoke dynamo wheel ~ 10 years ago, I don't think the hub was available on its own though.
06-19-18, 10:54 AM
#3
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Too bad there aren't 40-spoke dynamo hubs, because you could use one of those. I think you'll have to go with one of the more expensive models. Though the SP hubs look really nice, and you'll get your money's worth.
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06-19-18, 01:50 PM
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I remember the first time I laced up an SP hub, I was really struck by how close together the two flanges were. It was a real surprise when almost all front wheels I had laced up before had pretty wide flanges.
The flanges on the SP hubs are much closer together than on regular (non-dyno) hubs or Shimano dynohubs. I never built up a wheel with a Son hub, can't comment on that. I once saw that someone suggested that you should use four more spokes on an SP wheel than you would use on any other dynohub wheel because of the close flanges. I just tried to caliper the flange width on an SP, but with 36 spokes on the wheel I could only get a guess with my caliper at a bit over 50 mm. Exploded diagrams are easy to find, but I was too lazy to look. When I calipered a Shimano dynohub it appeared to have flanges that are about 8 or 9 mm farther apart than an SP. I have two SP hubs, one 32 and one 36 spokes. And my Shimano dynohubs are 32 spoke..
My point is that if you really feel you need to only have 20 spokes, you might think about a dynohub with wider flanges than the SP, if you can find one. Or, re-think how many spokes you really want. My 32 spoke SP hub is on a touring bike, but it is on my Titanium touring bike, so it only sees light duty, thus I think 32 spokes are adequate on that wheel.
Photo is of my 32 spoke SP. It is not a very good photo to show flange width but it is the best photo I have of it. If the photo looks confusing, I have a Tara rack and fenders on the fork to add complexity to the photo.
The flanges on the SP hubs are much closer together than on regular (non-dyno) hubs or Shimano dynohubs. I never built up a wheel with a Son hub, can't comment on that. I once saw that someone suggested that you should use four more spokes on an SP wheel than you would use on any other dynohub wheel because of the close flanges. I just tried to caliper the flange width on an SP, but with 36 spokes on the wheel I could only get a guess with my caliper at a bit over 50 mm. Exploded diagrams are easy to find, but I was too lazy to look. When I calipered a Shimano dynohub it appeared to have flanges that are about 8 or 9 mm farther apart than an SP. I have two SP hubs, one 32 and one 36 spokes. And my Shimano dynohubs are 32 spoke..
My point is that if you really feel you need to only have 20 spokes, you might think about a dynohub with wider flanges than the SP, if you can find one. Or, re-think how many spokes you really want. My 32 spoke SP hub is on a touring bike, but it is on my Titanium touring bike, so it only sees light duty, thus I think 32 spokes are adequate on that wheel.
Photo is of my 32 spoke SP. It is not a very good photo to show flange width but it is the best photo I have of it. If the photo looks confusing, I have a Tara rack and fenders on the fork to add complexity to the photo.
06-19-18, 01:52 PM
#5
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I wonder why the flanges are so close together.
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06-19-18, 02:29 PM
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the standard SON also has flanges that are close together. I got the widebody SON, which is a few bucks more, and you have to stare at Peter White's name flashing around and it causes an undeniable sense of dread and regret.
06-19-18, 03:15 PM
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I have no clue, but it did not stop me from buying a second one. My first one is on my expedition bike, 36 spokes, I used that wheel in the interior of Iceland, White Rim Trail in Canyonlands, Maah Daah Hey trail, etc., so it has held up under some heavy duty riding. I built up that bike in Spring 2013. Then last year (Spring 2017) I bought another for my Titanium touring bike. My Shimanos were obtained used, but both of my SPs I bought new.
This time I decided to look for the exploded diagram. Outside to outside flange width is exactly 50mm. Both of mine are the PV-8 models.
https://www.sp-dynamo.com/8-series-pic/PV-8-QR-01.pdf
Disc version also 50mm wide.
https://www.sp-dynamo.com/8-series-pic/PD-8-QR-01.pdf
I see no real risk from the narrow flanges as long as you do not get too skimpy on spokes.
This time I decided to look for the exploded diagram. Outside to outside flange width is exactly 50mm. Both of mine are the PV-8 models.
https://www.sp-dynamo.com/8-series-pic/PV-8-QR-01.pdf
Disc version also 50mm wide.
https://www.sp-dynamo.com/8-series-pic/PD-8-QR-01.pdf
I see no real risk from the narrow flanges as long as you do not get too skimpy on spokes.
06-19-18, 03:28 PM
#8
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# 1 Why 20 spoke ? My Mk2 Brompton had a 20 spoke wheel radially spoked from a Steel hub.
a 20 spoke with a rim made specifically for it
a 20 spoke with a rim made specifically for it
Last edited by fietsbob; 06-19-18 at 03:37 PM.
06-20-18, 09:10 AM
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I was thinking the OP wanted this for a 20" wheel. I thought there were a few choices for this.
06-20-18, 09:15 AM
#10
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06-20-18, 09:46 AM
#11
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Good point, @fietsbob. Well it doesn't really matter. Virtually all front wheels are stronger than they need to be, and narrowing the flanges doesn't hurt much.
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06-20-18, 11:17 AM
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I think he has a full size bike, not folder with small wheels. But not sure if he is coming back to this thread or not?
06-21-18, 01:06 PM
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"I found exactly what I am looking for but I am a bird so cheap cheap." Shutter Precision stuff is already quite cheap but also pretty decent quality, I see no reason to try and further go cheaper. Wally Mart does not make dynamo Huffies!
06-21-18, 05:12 PM
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i would check around online for better prices on Shimano and SP. Dynos are cheaper in Europe.
