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Wheel building data: Weinmann 27" LP18 & Origin-8 sealed bearing front track hub.

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Wheel building data: Weinmann 27" LP18 & Origin-8 sealed bearing front track hub.

Old 03-10-12, 09:30 AM
  #1  
kevbo
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Wheel building data: Weinmann 27" LP18 & Origin-8 sealed bearing front track hub.

Googled the heck out of this, and came up dry, but google indexes bike forum threads nicely, so hopefully this will help someone in the future:

Weinmann 27" LP18 ERD=616mm, no offset on the spoke bed. Note that this is NOT for a 700C rim!

Origin-8 sealed bearing front track hub has a spoke circle diameter of 62mm on both sides, and each flange is 34mm from center.

Here is the data as it would go into columns in the Spocalc rim and hub database:

616.0 0.0 27" 630 Weinmann LP18

2.4 62.0 34.0 62.0 34.0 F 100 Origin-8 sealed bearing front track hub

I am aware that this hub appears to sell under several other brandings, currently, and in the past. I don't know the specifics, so if anyone wants to add those datapoints to this thread, that might be helpful as well.

Spocalc gives a spoke length of 294.5mm to build a X3 wheel with these components.

These are rather cheap components often used for low-end fixed gear wheelsets. I am matching an existing rear wheel, and was unable to find anyone selling a pre-built front wheel alone...just F&R sets. Niagra had them in stock, if you found this thread trying to find a source for them.

Last edited by kevbo; 03-10-12 at 09:54 AM.
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Old 03-10-12, 10:11 AM
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I didn't calculate or look anything up but that spoke length sounds too short to me. I'm thinking you'll need something around 300mm.
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Old 03-10-12, 11:23 AM
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Originally Posted by Retro Grouch View Post
I didn't calculate or look anything up but that spoke length sounds too short to me. I'm thinking you'll need something around 300mm.
I think they may be the right length. According to the OP, his hub has a spoke hole circle of 62 mm which is a lot bigger than standard front hubs (Shimano 105, Dura Ace and Campy Chorus front hubs I have all measure 38 mm) so it is obviously a high flange and should require a shorter spoke, correct?
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Old 03-10-12, 11:38 AM
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When I built up a 3-cross 27" rear using a parallax mountain hub and a reused alex single wall rim, I used some 298mm spokes that were sitting around and had to trim about 3mm off the drive side spokes and just a tiny touch up on the NDS. If anything 295mm might be long for those flanges.

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Old 03-10-12, 11:41 AM
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Originally Posted by IthaDan View Post
If anything 395mm might be long for those flanges.
I agree, 395 mm will probably be a little long.
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Old 03-10-12, 11:52 AM
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I was hoping I'd caught that in time. Guess not.

Huh, guess the edit didn't stick.
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Old 03-10-12, 12:25 PM
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Originally Posted by HillRider View Post
I think they may be the right length. According to the OP, his hub has a spoke hole circle of 62 mm which is a lot bigger than standard front hubs (Shimano 105, Dura Ace and Campy Chorus front hubs I have all measure 38 mm) so it is obviously a high flange and should require a shorter spoke, correct?
Yeah, I was thinking of more typical low flange hubs.
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Old 03-10-12, 01:15 PM
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Before you proceed, you need to find out from the provider of the ERD what their reference was?

10mm or 12mm standard profile nipple? Where in the nipple are they aiming, flat, top, etc...

Otherwise you can't trust that ERD...

=8-)

294.69mm (36h) assuming the ERD is trustworthy....

=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.
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Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life
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Old 03-11-12, 12:05 PM
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I measured the ERD using the same nipples I will build the wheel with. I measured at two diameters, 90 degrees apart, and they were equal. Annoyingly, Weinmann doesn't provide a number for this rim.

I measured between the inner ends of opposing nipples, then added twice the end to shoulder dimension of the nipples.

In the past, I have used data published by Alexrims and Velocity, and spocalc computed length was perfect.

Last edited by kevbo; 03-11-12 at 12:12 PM.
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Old 03-11-12, 12:45 PM
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That's because Velocity is aiming for the flat of a standard profile 12mm nipple which works fine when calculated - and barely makes it with some restrictive 16mm nipples.

Use an ERD that assumes the top of a 10mm standard profile nipple and then swap in 12mm nipples common today - you start heading into trouble territory.

This is why publishers of ERDs need to provide a reference...so we know what they were doing when they came up with their numbers...

=8-)

http://www.youtube.com/watch?v=gCXFK...bYzuYRmOGpoQc=

=8-)
__________________
5000+ 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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